[patch] giant-less quotas for UFS

[Kostik Belousov]

On Mon, Apr 10, 2006 at 04:16:27PM +0200, Nicolas KOWALSKI wrote:
> Hello,
> 
> Kostik Belousov <kostikbel at gmail.com> writes:
> 
> > I already mailed about my development of the patch that
> > allows for UFS with quotas to operate without Giant. Sorry if the
> > repeat would be annoying.
> 
> Does this patch improve the performance of a file server, using
> multiple disks, controlled by quotas, exported by NFS/Samba ?
> 
> If so, I would be really interested: our file server (4.11, but
> perhaps 6.x soon), has some major slowdowns when one or multiple
> user/s exceed her/his quota ; this impact every user, even those
> working on another disk.
I don't think that patch shall have effect on this situation (quota exceeded).
Probably, you have some other issues, esp. for 4.x, where
only one process can progress in kernel mode anyway.
Just guessing: do you have slow (serial) console ?

Yes, I expect patch to improve overall system performance for 6.x/7 when
quotas are compiled in the kernel compared with the same kernel
config without patch. This was the reason for developing the change.
I do not have a numerical measurement of improvement, though.
I will be very glad for testing/stress testing/performance measurement
for the patch.

BUT, PLEASE BEWARE. Don't apply the patch for non-test machines.
Kris Kennaway said the system deadlocks with patch applied.
I still cannot reproduce it (and debug). In my defense I could say that I
did found two issues since Kris' report. Both are fixed.

Best regards,
Kostik Belousov.
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