Thanks for the tips; I'll look into TSC once I get to work. And like I said, I didn't know how much the optimization flags would do.
As far as the sysctl options, isn't net.core for any net connection, not just tcp? I have more than just a gameserver on there, so that's why I threw in the tcp values as well. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gary Stanley Sent: Friday, August 03, 2007 1:45 AM To: [email protected] Subject: Re: [hlds_linux] Possible fix for linux performance? At 07:45 AM 8/2/2007, Dan E wrote: >First off, I am running CentOS 5 with a custom-compiled 2.6.22 >kernel (dynamic/tickless, 1000hz (though it doesn't really matter >with a tickless kernel), HPET, CFQ, and low-latency patch). You can >get the low latency patch here: >http://people.redhat.com/mingo/realtime-preempt/ I think this may >have been the trick that actually did it, but I did a lot yesterday >so I can't be sure. If you apply it, make sure that you have the >"Complete Preemption" mode selected under "Processor types and features". > >I added some optimization flags while compiling the kernel, but I'm >not sure how much it will do (I'm not *that* big on development): >CXXFLAGS="-march=athlon-xp -O3 -ffast-math" HPET is expensive to read from userland, TSC is faster. TSC is unsafe on SMP machines because the TSC counter can change based on power management, and the temperature of each core. HPET has about 1200uS of latency to read from one of my opterons, whereas TSC is about 310uS Compiling a kernel with high (> -O2) optimizations won't really improve anything. Those are useless and won't affect anything except improve micro-benchmarks. >I added the following entries to /etc/sysctl.conf (easiest to do :P): >net.core.rmem_max = 16777216 >net.core.wmem_max = 16777216 >net.ipv4.tcp_rmem = 4096 87380 16777216 >net.ipv4.tcp_wmem = 4096 65536 16777216 > Useless, gameservers use UDP. Setting rmem/wmem that high will not do anything except consume more memory on each tcp connection. RFC1323 needs high rmem/wmem to function correctly. I think the only thing people should try is the realtime patch, and maybe try using TSC if they are sure it will work fine. _______________________________________________ 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
