338 lines
9.0 KiB
C++
338 lines
9.0 KiB
C++
/**
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* @file llviewerthrottle.cpp
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* @brief LLViewerThrottle class implementation
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*
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* $LicenseInfo:firstyear=2002&license=viewergpl$
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*
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* Copyright (c) 2002-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#include "llviewerprecompiledheaders.h"
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#include "llviewerthrottle.h"
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#include "llviewercontrol.h"
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#include "message.h"
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#include "llagent.h"
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#include "llframetimer.h"
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#include "llviewerstats.h"
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#include "lldatapacker.h"
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// consts
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// The viewer is allowed to set the under-the-hood bandwidth to 50%
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// greater than the prefs UI shows, under the assumption that the
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// viewer won't receive all the different message types at once.
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// I didn't design this, don't know who did. JC
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const F32 MAX_FRACTIONAL = 1.5f;
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const F32 MIN_FRACTIONAL = 0.2f;
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const F32 MIN_BANDWIDTH = 50.f;
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const F32 MAX_BANDWIDTH = 1500.f;
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const F32 STEP_FRACTIONAL = 0.1f;
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const F32 TIGHTEN_THROTTLE_THRESHOLD = 3.0f; // packet loss % per s
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const F32 EASE_THROTTLE_THRESHOLD = 0.5f; // packet loss % per s
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const F32 DYNAMIC_UPDATE_DURATION = 5.0f; // seconds
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LLViewerThrottle gViewerThrottle;
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// static
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const std:: string LLViewerThrottle::sNames[TC_EOF] = {
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"Resend",
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"Land",
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"Wind",
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"Cloud",
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"Task",
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"Texture",
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"Asset"
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};
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// Bandwidth settings for different bit rates, they're interpolated/extrapolated.
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// Resend Land Wind Cloud Task Texture Asset
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const F32 BW_PRESET_50[TC_EOF] = { 5, 10, 3, 3, 10, 10, 9 };
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const F32 BW_PRESET_300[TC_EOF] = { 30, 40, 9, 9, 86, 86, 40 };
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const F32 BW_PRESET_500[TC_EOF] = { 50, 70, 14, 14, 136, 136, 80 };
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const F32 BW_PRESET_1000[TC_EOF] = { 100, 100, 20, 20, 310, 310, 140 };
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LLViewerThrottleGroup::LLViewerThrottleGroup()
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{
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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mThrottles[i] = 0.f;
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}
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mThrottleTotal = 0.f;
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}
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LLViewerThrottleGroup::LLViewerThrottleGroup(const F32 settings[])
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{
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mThrottleTotal = 0.f;
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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mThrottles[i] = settings[i];
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mThrottleTotal += settings[i];
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}
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}
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LLViewerThrottleGroup LLViewerThrottleGroup::operator*(const F32 frac) const
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{
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LLViewerThrottleGroup res;
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res.mThrottleTotal = 0.f;
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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res.mThrottles[i] = mThrottles[i] * frac;
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res.mThrottleTotal += res.mThrottles[i];
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}
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return res;
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}
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LLViewerThrottleGroup LLViewerThrottleGroup::operator+(const LLViewerThrottleGroup &b) const
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{
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LLViewerThrottleGroup res;
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res.mThrottleTotal = 0.f;
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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res.mThrottles[i] = mThrottles[i] + b.mThrottles[i];
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res.mThrottleTotal += res.mThrottles[i];
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}
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return res;
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}
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LLViewerThrottleGroup LLViewerThrottleGroup::operator-(const LLViewerThrottleGroup &b) const
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{
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LLViewerThrottleGroup res;
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res.mThrottleTotal = 0.f;
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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res.mThrottles[i] = mThrottles[i] - b.mThrottles[i];
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res.mThrottleTotal += res.mThrottles[i];
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}
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return res;
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}
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void LLViewerThrottleGroup::sendToSim() const
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{
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llinfos << "Sending throttle settings, total BW " << mThrottleTotal << llendl;
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LLMessageSystem* msg = gMessageSystem;
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msg->newMessageFast(_PREHASH_AgentThrottle);
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msg->nextBlockFast(_PREHASH_AgentData);
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msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
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msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
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msg->addU32Fast(_PREHASH_CircuitCode, msg->mOurCircuitCode);
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msg->nextBlockFast(_PREHASH_Throttle);
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msg->addU32Fast(_PREHASH_GenCounter, 0);
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// Pack up the throttle data
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U8 tmp[64];
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LLDataPackerBinaryBuffer dp(tmp, MAX_THROTTLE_SIZE);
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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//sim wants BPS, not KBPS
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dp.packF32(mThrottles[i] * 1024.0f, "Throttle");
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}
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S32 len = dp.getCurrentSize();
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msg->addBinaryDataFast(_PREHASH_Throttles, tmp, len);
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gAgent.sendReliableMessage();
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}
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void LLViewerThrottleGroup::dump()
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{
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S32 i;
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for (i = 0; i < TC_EOF; i++)
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{
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LL_DEBUGS("Throttle") << LLViewerThrottle::sNames[i] << ": " << mThrottles[i] << LL_ENDL;
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}
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LL_DEBUGS("Throttle") << "Total: " << mThrottleTotal << LL_ENDL;
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}
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class LLBPSListener : public LLSimpleListener
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{
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public:
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virtual bool handleEvent(LLPointer<LLEvent> event, const LLSD& userdata)
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{
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gViewerThrottle.setMaxBandwidth((F32) event->getValue().asReal()*1024);
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return true;
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}
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};
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LLViewerThrottle::LLViewerThrottle() :
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mMaxBandwidth(0.f),
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mCurrentBandwidth(0.f),
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mThrottleFrac(1.f)
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{
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// Need to be pushed on in bandwidth order
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mPresets.push_back(LLViewerThrottleGroup(BW_PRESET_50));
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mPresets.push_back(LLViewerThrottleGroup(BW_PRESET_300));
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mPresets.push_back(LLViewerThrottleGroup(BW_PRESET_500));
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mPresets.push_back(LLViewerThrottleGroup(BW_PRESET_1000));
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}
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void LLViewerThrottle::setMaxBandwidth(F32 kbits_per_second, BOOL from_event)
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{
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if (!from_event)
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{
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gSavedSettings.setF32("ThrottleBandwidthKBPS", kbits_per_second);
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}
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gViewerThrottle.load();
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if (gAgent.getRegion())
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{
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gViewerThrottle.sendToSim();
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}
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}
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void LLViewerThrottle::load()
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{
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mMaxBandwidth = gSavedSettings.getF32("ThrottleBandwidthKBPS")*1024;
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resetDynamicThrottle();
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mCurrent.dump();
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}
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void LLViewerThrottle::save() const
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{
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gSavedSettings.setF32("ThrottleBandwidthKBPS", mMaxBandwidth/1024);
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}
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void LLViewerThrottle::sendToSim() const
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{
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mCurrent.sendToSim();
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}
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LLViewerThrottleGroup LLViewerThrottle::getThrottleGroup(const F32 bandwidth_kbps)
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{
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//Clamp the bandwidth users can set.
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F32 set_bandwidth = llclamp(bandwidth_kbps, MIN_BANDWIDTH, MAX_BANDWIDTH);
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S32 count = mPresets.size();
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S32 i;
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for (i = 0; i < count; i++)
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{
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if (mPresets[i].getTotal() > set_bandwidth)
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{
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break;
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}
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}
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if (i == 0)
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{
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// We return the minimum if it's less than the minimum
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return mPresets[0];
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}
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else if (i == count)
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{
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// Higher than the highest preset, we extrapolate out based on the
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// last two presets. This allows us to keep certain throttle channels from
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// growing in bandwidth
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F32 delta_bw = set_bandwidth - mPresets[count-1].getTotal();
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LLViewerThrottleGroup delta_throttle = mPresets[count - 1] - mPresets[count - 2];
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F32 delta_total = delta_throttle.getTotal();
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F32 delta_frac = delta_bw / delta_total;
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delta_throttle = delta_throttle * delta_frac;
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return mPresets[count-1] + delta_throttle;
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}
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else
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{
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// In between two presets, just interpolate
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F32 delta_bw = set_bandwidth - mPresets[i - 1].getTotal();
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LLViewerThrottleGroup delta_throttle = mPresets[i] - mPresets[i - 1];
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F32 delta_total = delta_throttle.getTotal();
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F32 delta_frac = delta_bw / delta_total;
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delta_throttle = delta_throttle * delta_frac;
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return mPresets[i - 1] + delta_throttle;
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}
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}
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// static
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void LLViewerThrottle::resetDynamicThrottle()
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{
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mThrottleFrac = MAX_FRACTIONAL;
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mCurrentBandwidth = mMaxBandwidth*MAX_FRACTIONAL;
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mCurrent = getThrottleGroup(mCurrentBandwidth / 1024.0f);
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}
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void LLViewerThrottle::updateDynamicThrottle()
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{
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if (mUpdateTimer.getElapsedTimeF32() < DYNAMIC_UPDATE_DURATION)
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{
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return;
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}
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mUpdateTimer.reset();
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if (LLViewerStats::getInstance()->mPacketsLostPercentStat.getMean() > TIGHTEN_THROTTLE_THRESHOLD)
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{
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if (mThrottleFrac <= MIN_FRACTIONAL || mCurrentBandwidth / 1024.0f <= MIN_BANDWIDTH)
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{
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return;
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}
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mThrottleFrac -= STEP_FRACTIONAL;
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mThrottleFrac = llmax(MIN_FRACTIONAL, mThrottleFrac);
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mCurrentBandwidth = mMaxBandwidth * mThrottleFrac;
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mCurrent = getThrottleGroup(mCurrentBandwidth / 1024.0f);
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mCurrent.sendToSim();
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llinfos << "Tightening network throttle to " << mCurrentBandwidth << llendl;
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}
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else if (LLViewerStats::getInstance()->mPacketsLostPercentStat.getMean() <= EASE_THROTTLE_THRESHOLD)
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{
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if (mThrottleFrac >= MAX_FRACTIONAL || mCurrentBandwidth / 1024.0f >= MAX_BANDWIDTH)
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{
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return;
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}
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mThrottleFrac += STEP_FRACTIONAL;
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mThrottleFrac = llmin(MAX_FRACTIONAL, mThrottleFrac);
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mCurrentBandwidth = mMaxBandwidth * mThrottleFrac;
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mCurrent = getThrottleGroup(mCurrentBandwidth/1024.0f);
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mCurrent.sendToSim();
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llinfos << "Easing network throttle to " << mCurrentBandwidth << llendl;
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}
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}
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