Re: Huge disk performance degradation STILL IN 2.4.10

Wolly (
Mon, 24 Sep 2001 17:05:13 +0200

On Monday 24 September 2001 01:55, Chris Mason wrote:
> On Monday, September 24, 2001 01:19:18 AM +0200 Wolly <>
> wrote:
> > Hi kernel hackers,
> >
> > As soon as 2.4.10 was out, I got the patch and tested it again.
> > The problem is still there and did not get better at all.
> Could you please mount the FS with -o notail and try again? I think your
> test is hitting a worst case in the 2.4.x reiserfs tail code.
Okay, I plugged some old hd into my computer and formatted one half with
ext2, the other half with reiserfs.
It seems to be definitely a reiserfs issue because I cannot trigger the
performance loss (permament hd head positioning) with ext2. However,
passing -o notail when mounting does not help. (-o notail is accepted and
`bash# mount' displays `/dev/hdxy on /mnt type reiserfs (rw,notail)')

Could you reproduce this? Did you even try?
And why does this not show up on kernels <=2.4.6 and shows up
with linux>=2.4.9 (2.4.7, 2.4.8: unknown)?

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