Messages in this thread | | | Date | Tue, 19 Aug 2003 15:54:53 +1000 | From | Nick Piggin <> | Subject | Re: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx) |
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Stefan Foerster wrote:
>[I've sent this mail aleready, but got an error from my MAILER-DAEMON. >Perhaps ist was too large vor lkml, so I'm moving the oprofile output >to a webserver] > >* Andrew Morton <akpm@osdl.org> wrote: > >>Stefan Foerster <stefan@stefan-foerster.de> wrote: >> >>>* Andrew Morton <akpm@osdl.org> wrote: >>> >>>>Stefan Foerster <stefan@stefan-foerster.de> wrote: >>>>A kernel profile would be needed to diagnose this. You could use >>>>readprofile, but as it may be an interrupt problem, the NMI-based oprofile >>>>output would be better. >>>> >>>Is this procedure documented anywhere? >>> > >[every information I needed] > >I did the following steps: > > >opcontrol --setup --vmlinux=/usr/src/linux/vmlinux --event=RETIRED_INSNS:100000:0:1:1 > >Then I used your shell source: > >~/shells/oprofileit dd if=/dev/zero of=test bs=1024 count=1048576 > >opreport -l /usr/src/linux/vmlinux > /tmp/1 >opreport -ld -D /usr/src/linux/vmlinux > /tmp/2 > >During the dd, again the xmms playing a file from an tmpfs froze and >even screen redrawing was very, very slow. > >The output of these commands kan be found at: > >http://home.in.tum.de/foerstes/oprofile-1 >http://home.in.tum.de/foerstes/oprofile-2 > >Is this information useful in debugging my problem, or should I go and >try again with readprofile or other tools? >
Nothing jumps out at me. Is your machine swapping during the bad behaviour? What is the effect of echo 0 > /proc/sys/vm/swappiness, swapoff -a, or using the deadline IO scheduler (boot with argument elevator=deadline)
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