The master game clock is driven by QueryPerformanceCounter() on win32 and gettimeofday() on linux.
Still, we have had reports of clock issues with QPC() (not this particular issue however) on AMD x2 systems that were fixed by forcing affinity. Also, for winxp/xp64 there is a chipset driver update that AMD recommends installing to address some timing issues. I don't have the info from AMD handy, but someone has written about it here (and provides links to downloads): http://ucguides.savagehelp.com/Quake4/FAQ_DualCore.htm#AMD RDTSC is used for the +showbudget panel. There are some issues with that on AMD x2 systems, but that is limited to the profiling code. Jay > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Jeffrey "botman" Broome > Sent: Wednesday, April 12, 2006 6:36 AM > To: [email protected] > Subject: Re: [hlcoders] gpGlobals->realtime standing still > > Jay Stelly wrote: > > What platform? (linux/win32)? On linux realtime is just > accumulating > > changes from repeated calls to gettimeofday() Have you compared > > gpGlobals->realtime to the output of Plat_FloatTime() ? > Are they both > > slow/stopped or just realtime? > > > > Has anyone else encountered this problem? > > ...also, what CPU (Intel or AMD)? Are you running multiple > cores and/or CPUs? I remember recently reading about an AMD > problem with multiple cores (or was it multiple CPUs) where > the RDTSC instruction's time wasn't syncronized between > CPUs/cores so when called once by code, it would return the > ticks from core 0, when called again, it would return the > ticks from core 1 (which could be different). This would > make the system appear to jump ahead in time and/or go back > in time. If HL2 is using RDTSC instead of > QueryPerformanceCounter(), it could get odd results on AMD > multi-CPU systems. If memory serves correctly, Windows > forces QueryPerformanceCounter() to always run on CPU 0, so > you don't get any discrepancy between calls. > > -- > Jeffrey "botman" Broome > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list > archives, please visit: > http://list.valvesoftware.com/mailman/listinfo/hlcoders > > _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlcoders
