So what is the secret to achieving 2000 fps if I dump the real time patch? I've never tried this but am now thinking about it.
------------------------------------------ On Sat, Sep 5, 2009 at 9:50 AM, Joseph Laws <[email protected]> wrote: > I've never cared for the RT patches...but the hi-res timers pre 2.6.24 > are very solid. > > John wrote: > >>> You need high res timers (HPET), on a newer kernel (2.6.24) > >>> > >>> -M > >>> > >> I hated that kernel version. I'm running 2.6.26.5-rt8. And even with > hpet > >> enabled you still want the higher kernel frequency wouldn't you? > >> > > > > I think Gary meant that you'd need a 2.6.24 or later kernel. HPET and > > hrtimers are a rather new addition to Linux. > > > > If you run something beyond 2.6.26 or so, make sure to also flag the > server > > as a "real-time" process to remove the kernel's built-in SCHED_OTHER > timer > > slack, which defaults to 50 usec and makes the FPS a bit less stable. > This > > can be done with the "chrt" utility. > > > > With high resolution timers enabled, your machine doesn't need to run at > > 1000hz, because processes will be woken up at the right times regardless. > In > > fact, a lower hz rate like 100 generally works out better; the lower > number > > leads to less flipping of processes between CPUs, fewer unnecessary > context > > switches to the kernel, etc. The only real advantage to a high hz might > be > > in more accurate process accounting. > > > > In my testing, the "-rt" kernel patchset led to an overall reduction in > > performance, due to the additional context switching. YMMV. > > > > -John > > > > > > _______________________________________________ > > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > > http://list.valvesoftware.com/mailman/listinfo/hlds_linux > > ------------------------------------------------------------------------ > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 8.5.409 / Virus Database: 270.13.77/2346 - Release Date: > 09/04/09 17:51:00 > > > > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > http://list.valvesoftware.com/mailman/listinfo/hlds_linux > _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds_linux
