On 08/10/06, Jens Axboe <[email protected]> wrote:
On Sun, Oct 08 2006, Christian wrote:
> Am Freitag, 6. Oktober 2006 17:58 schrieb Paolo Ornati:
> > On Sun, 13 Aug 2006 18:15:12 +0200
> >
> > Matthias Dahl <[email protected]> wrote:
> > > Just let me know once you got them, so I can safely delete them again.
> > >
> > > At the moment, I am trying without preemption but for example doing a
> > > untar kernel sources still results in sluggish system responsiveness. :-(
> >
> > I used to have this type of problem and 2.6.19-rc1 looks much better
> > than 2.6.18.
> >
> > I'm using CONFIG_PREEMPT + CONFIG_PREEMPT_BKL, CFQ i/o scheduler
> > and /proc/sys/vm/swappiness = 20.
>
>
> Which change in the new kernel has made it better? I was following the lkml
> very close and didn't see any change that could have fixed that problem.
There is a substantial CFQ update, so it could be that. Or it could be
something unrelated of course, I didn't check if eg the cpu scheduler
changed much. Or vm :-)
--
Jens Axboe
I want to chime in here and let you know that I've experienced
something similar.
I'm using CFQ as my default I/O schedular.
Since 2.6.18-git<something_I'm_not_sure_of> I've experienced that when
doing heavy (or even not so heave) disk I/O my system gets very
sluggish. Observable by the fact that my mouse pointer in X "jumps"
which it never did before, and switching windows I can see the new
window repaint slowly whereas earlier it would just snap onto the
screen.
<serious hand-waving enabled>
This is quite unreliable, but I *seem* to have observed a slightly
higher overall memory use for my system since 2.6.18+ as well as the
software interrupt rate (as observable by 'top' oscilating between 1.5
& 5 % with 2.6.18+ where with older kernels it would seem to mostly
stay below 1%.
I've also observed that when rebooting, unmounting my local
filesystems takes significantly longer (previously just a second or
two, recently up to a minute or not at all, that is, the system just
hangs) - may or may not be related to this.
<serious hand-waving disabled>
In any case, disk I/O seems to have a large negative impact on system
performance recently compared to pre-2.6.18* kernels.
--
Jesper Juhl <[email protected]>
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