linux-kernel - Re: 2.6.24-rc1: First impressions

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Date:	Fri, 26 Oct 2007 21:33:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	spamtrap@...bisoft.de, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, wfg@...l.ustc.edu.cn,
	torvalds@...ux-foundation.org, riel@...hat.com
Subject: Re: 2.6.24-rc1: First impressions


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> > > dd1 - copy 16 GB from /dev/zero to local FS
> > > dd1-dir - same, but using O_DIRECT for output
> > > dd2/dd2-dir - copy 2x7.6 GB in parallel from /dev/zero to local FS
> > > dd3/dd3-dir - copy 3x5.2 GB in parallel from /dev/zero lo local FS
> > > net1 - copy 5.2 GB from NFS3 share to local FS
> > > mix3 - copy 3x5.2 GB from /dev/zero to local disk and two NFS3 shares
> > > 
> > >  I did the numbers for 2.6.19.2, 2.6.22.6 and 2.6.24-rc1. All units 
> > >  are MB/sec.
> > > 
> > > test           2.6.19.2     2.6.22.6    2.6.24.-rc1
> > > ----------------------------------------------------------------
> > > dd1                  28           50             96
> > > dd1-dir              88           88             86
> > > dd2              2x16.5         2x11         2x44.5
> > > dd2-dir            2x44         2x44           2x43
> > > dd3               3x9.8        3x8.7           3x30
> > > dd3-dir          3x29.5       3x29.5         3x28.5
> > > net1              30-33        50-55          37-52
> > > mix3              17/32        25/50          96/35 (disk/combined-network)
> > 
> > wow, really nice results!
> 
> Those changes seem suspiciously large to me.  I wonder if there's less 
> physical IO happening during the timed run, and correspondingly more 
> afterwards.

so a final 'sync' should be added to the test too, and the time it takes 
factored into the bandwidth numbers?

> > I think the MM should get out of deep-feature-freeze mode - there's 
> > tons of room to improve :-/
>
> Kidding.  We merge about 265 MM patches in 2.6.24-rc1:
>
>  482 files changed, 8071 insertions(+), 5142 deletions(-)

impressive :)

	Ingo
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