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SubjectRe: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
On Sun, Sep 13, 2015 at 09:12:44AM -0400, Chris Mason wrote:
> On Sat, Sep 12, 2015 at 07:46:32PM -0400, Chris Mason wrote:
> > I don't think the XFS numbers can be trusted too much since it was
> > basically bottlenecked behind that single pegged CPU. It was bouncing
> > around and I couldn't quite track it down to a process name (or perf
> > profile).
>
> I'll do more runs Monday, but I was able to grab a perf profile of the
> pegged XFS CPU. It was just the writeback worker thread, and it
> hit btrfs differently because we defer more of this stuff to endio
> workers, effectively spreading it out over more CPUs.
>
> With 4 mount points intead of 2, XFS goes from 140K files/sec to 250K.
> Here's one of the profiles, but it bounced around a lot so I wouldn't
> use this to actually tune anything:

mkfs.xfs -d agcount=64 ....

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com


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