Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

Kasper Sandberg
2007-08-08T14:41:03Z

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First off, sorry for the late response.

On Thu, 2007-08-02 at 17:42 +0200, Ingo Molnar wrote:
> Kasper,
>
> could you please try the "chew-max" latency-printing utility:
>
> http://people.redhat.com/mingo/cfs-scheduler/tools/chew-max.c
>
> if you start it on an idle system it prints a single line:
>
> $ ./chew-max
> pid 14506, prio 0, interval of 99984800 nsec
>
> and prints nothing else. It continues looping and looping (using up 100%
> of CPU time), and the moment it's preempted, it prints a line about that
> preemption latency. Under higher load it will print something like this:
>
> out for 63 ms [max: 66], ran for 5 ms, load 7
> out for 85 ms [max: 85], ran for 4 ms, load 5
> out for 7 ms [max: 85], ran for 0 ms, load 0
> out for 105 ms [max: 105], ran for 3 ms, load 3
> out for 174 ms [max: 174], ran for 6 ms, load 3
> out for 219 ms [max: 219], ran for 3 ms, load 1
> out for 78 ms [max: 219], ran for 3 ms, load 3
>
> so that we get a picture of your latencies, could you run this tool why
> you are seeing those 'bad' desktop latencies? (Since your CPU has two
bad is not the exact word, its pretty good, certainly better than old
vanilla scheduler, just not as smooth as could be.
> cores it might make sense to run two instances of chew-max.)

its a singlecore socket 754 firstgen amd64 :)

>
> record the latencies like this:
>
> ./chew-max > chew1.out &
> ./chew-max > chew2.out &
>
> and send us the chew1.out and chew2.out files (bzip2 -9 compressed).
> Thanks!

i've attached it(bzip2'ed)

i've come to think it is IO related, but not entirely related to
reiserfs, perhaps xfs.

i will conduct some tests as soon as possible.

>
> Ingo
> -
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