Hello, I have some new info about 1000fps servers that we were discussing in November 2008.
Old topic is here: http://list.valvesoftware.com/mailman/private/hlds_linux/2008-November/058527.html So, I was able to get constant 1000fps server, by constant I mean no drops, not single one (sorry for arguing too much in November, I was wrong). But there are some issues I encountered. 1. I think htop, top and others are not showing CPU usage correct. 0% of all cores when 10 fully loaded 12 player 1000fps servers with pingboost 3, it's funny. 2. segfaults, sometimes it just hangs. I don't know why, debug says nothing, but I was able to minimize if not eliminate those segfaults (but I don't know how, yet). I'm using Gentoo 64bit, but it should be almost same for any other Linux disto. Here is the kernel config: http://kveri.com/1000fps_kernel_config If you're willing to try it, I'll be glad. First of all: it's vanilla kernel 2.6.26.8 (kernel.org) NO RT patch just this config and these few steps: include/asm/param.h (or any other param.h under include dir in kernel root): #ifdef __KERNEL__ # define HZ 2100 /* Internal kernel timer frequency */ # define USER_HZ 1 /* some user interfaces are */ # define CLOCKS_PER_SEC 1 /* in "ticks" like times() */ #endif include/linux/jiffies.h: change #elif HZ >= 1536 && HZ < 3072 # define SHIFT_HZ 11 to #elif HZ >= 1536 && HZ < 3072 # define SHIFT_HZ 1 and change # define LATCH ((CLOCK_TICK_RATE + HZ / 2) / HZ) / * For divider * / to #define LATCH ((CLOCK_TICK_RATE + 2200/2) / 2200) /* For divider */ kernel/timeconst.pl: change (comment it) print "#if HZ != $hz\n"; print "#error \"kernel/timeconst.h has the wrong HZ value!\"\n"; print "#endif\n"; to # print "#if HZ != $hz\n"; # print "#error \"kernel/timeconst.h has the wrong HZ value!\"\n"; # print "#endif\n"; and execute: kernel/timeconst.pl 2100 > kernel/timeconst.h *this step is probably why my CPU stats aren't working correctly anymore*. Next, use TSC clocksource, for grub: add clocksource="tsc" to your kernel command line in menu.lst/grub.conf for lilo: add append="clocksource=TSC" to your /etc/lilo.conf, under this kernel image and execute /sbin/lilo. I didn't try hpet, but it probably worth trying, as well as changing CPU I/O schedulers in kernel. That config I posted above is heavily optimized for my hardware, but it can be optimized further, make sure it suits your hardware. My experiences: with RT patch I was able to get around 900 fps, but not as stable as without RT patch. I tried 4 different kernels (all 2.6.26.8): 1. without RT without HZ modification, without RT with HZ, with RT without HZ and with RT with HZ. Best one was without RT with HZ (that one I was discribing). Pingboost: I tried anything from pingboost 0 (no -pingboost) to pingboost 3, nothing except pingboost 3 gave me 1000fps constant. Sys_ticrate: well, it looks like anything more than HZ in kernel (2100) makes game accelerated, so I'm using sys_ticrate 2000 for now. If anyone tries this method/config please let me know what are your results, I'll be very interested. That HZ guide was from: http://www.howto-cs16-root.de/gen_kernel.htm some other tips: http://wiki.fragaholics.de/index.php/EN:Linux_Kernel_Optimization Please, anyone who has experience in this, share it too. Thanks Kveri -- Tato sprava bola prehladana na vyskyt virusov a nebezpecneho obsahu antivirovym systemom a zda sa byt cista. _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds_linux
