i just have jiffies in as an available clocksource... there a way to get htpet and tsc?
On Sat, Mar 7, 2009 at 8:34 AM, Gary Stanley <g...@velocity-servers.net>wrote: > At 08:27 AM 3/7/2009, listac...@lvwnet.com wrote: > > > I feel like such a linux nub... how do you set your clocksource? > > > >On any fairly recent 2.6-series kernel you can put this right on the > >kernel boot commandline: > > > >clocksource=$whatever > > > >like > > > >clocksource=hpet > > > >or > > > >clocksource=tsc > > > >so that it is set at boot. > > > >The echoing of available options into the /sys entry is valid as well, ie: > > > ># echo "hpet" > > >/sys/devices/system/clocksource/clocksource0/current_clocksource > > > >but is more of a post-boot type thing. That's not bad, necessarily. You > >can use it to change the clocksource post-boot. This is useful if you are > >experimenting with different ones because you can change the clocksource > >without rebooting. > > > >So to get a list of which clocksources your hardware has available: > > > ># cat /sys/devices/system/clocksource/clocksource0/current_clocksource > > > >you'll get something like this back (but it will vary from system to > system): > > > >tsc jiffies hpet acpi_pm > > > > > > > >Someone else asked whether running a 500Hz timer resolution will allow you > >to get a stable 500 server fps. I'm not going to say it is impossible, > >but I will say that *I* have yet to find a server machine (server-class > >hardware) that would let me get 500fps with a 500Hz kernel. > > I was able to get it running on a test machine. > > >I've only ever been able to get 500 server fps with a 1000Hz or tickless > >kernel, and setting fps_max to 600 or higher. > > > >Entirely possible I'm just not doing it right though. But what I do > >works, so I keep doing it. :) > > > >Setting fps_max to 600 usually gets me around 490-496 server fps. CPU > >utilization for the core a full 30-slot server runs on is usually around > >60-65% on a 2.5GHz Harpertown but it does briefly peak higher at times. > > > >This is under F10 x86_64 with a stock 2.6.27 kernel (which I'm pretty sure > >is built dynamic/tickless) and I can get ~1000 server fps out of it for > >our CS:S games by setting fps_max to 2000. I'm using clocksource=hpet > >currently, but have considered experimenting with tsc since I've read that > >there are some recent userspace optimizations in glibc for it on x86_64 > >which may be of benefit. > > That only happens if the binaries are x86_64. > > > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > http://list.valvesoftware.com/mailman/listinfo/hlds_linux > -- >From Ben B. (Goerge) _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds_linux
