Re: 2.5.60-mm2

From: Thomas Schlichter (
Date: Fri Feb 14 2003 - 05:10:41 EST

On Friday, 14. February 2003 10:38, Dave Jones wrote:
> On Fri, Feb 14, 2003 at 01:31:44AM -0800, Andrew Morton wrote:
> > . Considerable poking at the NFS MAP_SHARED OOM lockup. It is limping
> > along now, but writeout bandwidth is poor and it is still struggling.
> > Needs work.
> >
> > . There's a one-liner which removes an O(n^2) search in the NFS
> > writeback path. It increases writeout bandwidth by 4x and decreases CPU
> > load from 100% to 3%. Needs work.
> I'm puzzled that you've had NFS stable enough to test these.
> How much testing has this stuff had? Here 2.5.60+bk clients fall over under
> moderate NFS load. (And go splat quickly under high load).
> Trying to run things like dbench causes lockups, fsx/fstress made it
> reboot, plus the odd 'cheating' errors reported yesterday.
> Dave

I've got NFS problems with 2.5.5x - 60-bk3, too, but here I can workaround
them by simply pinging the NFS-server every second... Funny, but it works!
Perhaps this can help finding the real bug?!


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