linux-kernel - Re: Performance regressions in 2.6.30-rc7?

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Date:	Sat, 30 May 2009 18:51:47 +0200
From:	Diego Calleja <diegocg@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Performance regressions in 2.6.30-rc7?

On Sábado 30 Mayo 2009 06:07:18 Andrew Morton escribió:
> Those regressions are huge.  They appear to be on compute-intensive
> workloads too.
> 
> I wonder if some expensive debugging option turned itself on or
> something silly like that.

They use the vanilla kernels that ubuntu ship with their own configs,
so they shouldn't be using any expensive debugging option.

I've run myself two of those tests (I've not tested gnupg as I'm
allergic to it). I can't reproduce any regression with 7zip, I'm however
able to reproduce the regression in tiobench write latency, using 32
threads and 64 MB block size (--threads 32 --block 65536). I used ext4
(phoronix uses ext3).

Random Writes
                              File  Blk   Num                   Avg      Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      >2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----------  -------- -------- -----
2.6.29                        2000  65536  32   24.16 107.2%     0.051        0.21   0.00000  0.00000    23

Random Writes
                              File  Blk   Num                   Avg      Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      >2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----------  -------- -------- -----
2.6.30-rc7-00149-g3218911     2000  65536  32   23.06 178.4%     0.711      164.72   0.00000  0.00000    13

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