performance problems with XFS and Linux kernel 2.6.24.4

["Bond Masuda" <bond.masuda@xxxxxxxxxx>]

Hi,

I am aware of the change regarding barrier/nobarrier in 2.6.17 and above.
However, the performance hit I'm seeing is very severe and much worse than
what I was seeing in 2.6.17 (bundled with latest updates in Fedora Core 4).

I'm currently running Fedora 8 with 2.6.24.4-64.fc8. If I remove nobarrier
mount option, it takes seconds just to write few megabytes and the system
becomes very very sluggish. On 2.6.17 (Fedora 4) without the nobarrier
option it was still usable.

The XFS file system is about 900GB, if that matters.

Is this a known problem? How can I gather more information to figure out
exactly what is going on?

Thanks,
-Bond