dog slow i/o performance with redhat kernel 2.4.20

[colbey@dreamwerx.net]

I'm going to update my last reply... After moving all the data over to
this box.. I've noticed the same "dog slow i/o" as reported by:

brien <brienfwd at bigfoot.com>

I was running a backup of files, from/to the same partition of about 8.5GB
and it took about 20 minutes I'd guess..  This is crazy as it didn't take
much more than that to move the data over the network to the server.

The box is almost the same config:  pe2450, 2x 933p3, 1gb ram, perc 3/si,
raid 5 (4x18-10k), running ext2

I'm going to myself check the changelogs... see if I can see anything...

to the hunt..



On Fri, 31 Jan 2003 colbey at dreamwerx.net wrote:

>
> I just installed the very same server 2 days ago... I was running 2.4.18
> (default with distro install) and noticed a bit of lag while uncompressing
> the 2.4.20 kernel for a custom compile.. but after it was installed i
> haven't seen it since..
>
> I haven't done alot with the box yet..   I'd check changelog for .18 ->
> .20 perhaps..
>
>
>
> On Fri, 31 Jan 2003, brien wrote:
>
> > hi,
> >
> > i posted this on the dell aacraid mailing list with no response.  hopefully
> > someone here can help me troubleshoot this.
> >
> > i've recently upgraded from the redhat linux 2.4.9 kernel to 2.4.18 and
> > noticed a very large degradation in performance which seems to be due to
> > slow disk i/o.  my setup is a dell 2450, 2x 866 P3, 2GB RAM, Perc 3/Si,
> > RAID 1+0.  the server is serving IMAP and NFS.  it looks like the IMAP disk
> > i/o which used to be a blip on the radar is now killing the machine.
> >
> > i've upgraded to the latest 2.7.1 firmware and this didn't solve the
> > problem.  i don't have any scsi related errors in any logs.  has something
> > changed with the aacraid driver between these kernel versions?  is this a
> > known issue and is it being addressed?
> >
> > thanks,
> > brien
> >
> >
> >
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