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SubjectRe: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx)
[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 <> wrote:
> Stefan Foerster <> wrote:
> > * Andrew Morton <> wrote:
> > > Stefan Foerster <> 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:

Is this information useful in debugging my problem, or should I go and
try again with readprofile or other tools?


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