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Make NET_Sleep wait 1ms less than requested, then busy-wait the last ms for better timeout precision.
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2 changed files with 11 additions and 23 deletions
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@ -2907,7 +2907,7 @@ void Com_Frame( void ) {
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int msec, minMsec;
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int timeVal;
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static int lastTime = 0;
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static int lastTime = 0, bias = 0;
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int timeBeforeFirstEvents;
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int timeBeforeServer;
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@ -2953,18 +2953,14 @@ void Com_Frame( void ) {
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minMsec = 1;
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timeVal = com_frameTime - lastTime;
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if(timeVal > minMsec)
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{
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// Adjust minMsec if previous frame took too long to render so
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// that framerate is stable at the requested value.
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timeVal -= minMsec;
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if(timeVal > minMsec)
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minMsec = 0;
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else
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minMsec -= timeVal;
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}
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bias += timeVal - minMsec;
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if(bias > minMsec)
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bias = minMsec;
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// Adjust minMsec if previous frame took too long to render so
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// that framerate is stable at the requested value.
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minMsec -= bias;
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}
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}
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else
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@ -2973,10 +2969,11 @@ void Com_Frame( void ) {
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timeVal = 0;
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do
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{
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if(com_busyWait->integer)
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// Busy sleep the last millisecond for better timeout precision
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if(com_busyWait->integer || timeVal < 2)
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NET_Sleep(0);
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else
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NET_Sleep(timeVal);
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NET_Sleep(timeVal - 1);
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msec = Sys_Milliseconds() - com_frameTime;
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@ -1707,18 +1707,9 @@ void NET_Sleep(int msec)
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if(highestfd < 0)
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{
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// windows ain't happy when select is called without valid FDs
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if(msec > 0)
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msec--;
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SleepEx(msec, 0);
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return;
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}
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#define TVW32_BIAS 999
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// windows adds a whole millisecond of latency, otherwise granularity seems to be fine.
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if(timeout.tv_usec > TVW32_BIAS)
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timeout.tv_usec -= TVW32_BIAS;
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#endif
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retval = select(highestfd + 1, &fdr, NULL, NULL, &timeout);
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