On Tuesday 17 April 2007, Ingo Molnar wrote: >* Gene Heskett <[EMAIL PROTECTED]> wrote: >> This one (v2-rc2) is not a keeper I'm sorry to say, Ingo. v2-rc0 was >> much better. Watching amanda run with htop, kmails composer is being >> subjected to 5 to 10 second pauses, and htop says that gzip -best >> isn't getting more that 15% of the cpu, and the /amandatapes drive is >> being written to in a regular pattern that seems to be the cause of >> the pauses according to gkrellm, which also seems to track the size of >> the writes, and can show anything from 4.3k to 54 megs as being >> written in one cycle of its screen update. > >ok - fortunately the delta between -v2-rc0 and -v2-final is pretty >small. One difference is the child-runs-first fix. To restore the >parent-runs-first logic, do this: > I'm running 21-rc7-CFS-v2-rc0.1 now.
> echo 0 > /proc/sys/kernel/sched_child_runs_first This is currently a 1. Reset to 0 by the above. >does this make any difference? Hard to tell, not much running except fetchmail/procmail and this composer. > >If not then pretty much the only other change was the nice level tweak i >did. Could you try to grab a few snapshots of scheduling state via >something like: > > while sleep 1; do cat /proc/sched_debug >> to-ingo.txt; done The crf1.txt is with it=1, the cfr0.txt is with it zeroed. >(and tell me the PID of the kmail composer, to make sure i'm checking >the right task's behavior.) And I let the crf0 version run longer as I was looking for the composer's pid, but htop (or I) can't see it. Even a ps -e isn't seeing it! But its running, I'm actively typing in it. So you get 3 files, the third one called ps-e.txt, in private mail. I thought it was called composer, I really did. > >also, as a separate experiment, could you perhaps run this script as >root: > > cd /proc; for N in [1-9]*; do renice -n 0 $N; done > >this will move all tasks in the system to nice level 0 and should make >any nice level handling logic in the scheduler irrelevant. Do you have X >reniced perhaps? > >Lots of system threads have negative or positive nice levels, so once >you have executed this script, only a reboot will be a practical way to >restore it to the previous settings. > > Ingo -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) I have many CHARTS and DIAGRAMS.. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
