Re: XFS and 2.6.18 -> 2.6.20-rc3

[David Chinner <dgc@xxxxxxx>]

On Wed, Jan 10, 2007 at 07:29:15AM -0600, Mr. Berkley Shands wrote:
> With a fresh install of the O/S on a non-broken motherboard, the change to
> 
> /proc/sys/vm/dirty_ratio
> 
> restores most of the lost performance from 2.6.18,
> as of 2.6.20-rc4. The difference is 10% to 15% without the dirty_ratio
> change (40 is the default, 10 gives the old performance).

....

> So whatever needs to be tweaked in the VM system seems to be the key.
> 
> Thanks to all for getting this regression repaired.

Well, it's not repaired as such - you've got a WAR for the problem.
I'll report the problem to lkml so that the VM gurus can try to
really fix the problem....

Thanks for confirming that the dirty_ratio tweak also worked
for you.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group