Re: Hot rb_next, setup_cluster_no_bitmap

Simon Kirby
2011-08-03T23:10:59Z

On Wed, Aug 03, 2011 at 03:39:49PM -0700, Simon Kirby wrote:

> On Wed, Aug 03, 2011 at 03:06:55PM -0700, Simon Kirby wrote:
>
> > I see Josef''s 86d4a77ba3dc4ace238a0556541a41df2bd71d49
introduced the
> > bitmaps list. I could try temporarily reverting this (some fixups
needed)
> > if anybody thinks my cache bouncing idea might be slightly possible.
>
> I''ll try the attached and see how the profile changes.

Hmm, I bound the SMP affinity of all of the btrfs processes to one CPU,
and the page dirtying rate got slower, so I suspect the writes aren''t
really a big deal, and the problem is just that there is way too much
walking going on after rsync has ran for a while and loads everything
into memory.

Any ideas?