Public bug reported:
Binary package hint: linux-image-2.6.27-7-generic
After upgrading to Ubuntu 8.10, I observed a very poor filesystem
performance compared to pre-upgrade system. After some examining, I was
able to pinpoint it to kernel.
This is a quadcore x86_64 system.
$ lsb_release -rd
Description: Ubuntu 8.10
Release: 8.10
(Upgraded from 8.04)
$ mount
/dev/md1 on / type xfs (rw,relatime)
Here are simple benchmarks, as I had 8.04 kernel available. All
measurements done after a reboot to ensure cold caches.
2.6.24-21-generic:
$ time tar xf linux-2.6.27.tar.bz2
real 0m53.399s
user 0m15.797s
sys 0m2.556s
$ time rm -rf linux-2.6.27
real 0m31.863s
user 0m0.016s
sys 0m1.796s
2.6.27-7-generic:
$ time tar xf linux-2.6.27.tar.bz2
real 6m18.707s
user 0m16.493s
sys 0m2.932s
$ time rm -rf linux-2.6.27
real 4m54.166s
user 0m0.028s
sys 0m2.076s
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Very low XFS performance with Ubuntu 8.10 kernel
https://bugs.launchpad.net/bugs/294069
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