Re: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx)
From: Stefan Foerster
Date: Tue Aug 19 2003 - 00:54:27 EST
[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@xxxxxxxx> wrote:
> Stefan Foerster <stefan@xxxxxxxxxxxxxxxxxx> wrote:
> > * Andrew Morton <akpm@xxxxxxxx> wrote:
> > > Stefan Foerster <stefan@xxxxxxxxxxxxxxxxxx> 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?
Ciao,
Stefan
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