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

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Date:	Fri, 26 Oct 2007 17:22:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Martin Knoblauch <spamtrap@...bisoft.de>
Cc:	linux-kernel@...r.kernel.org,
	Peter zijlstra <a.p.zijlstra@...llo.nl>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: 2.6.24-rc1: First impressions


* Martin Knoblauch <spamtrap@...bisoft.de> wrote:

> Hi ,
> 
>  just to give some feedback on 2.6.24-rc1. For some time I am tracking 
>  IO/writeback problems that hurt system responsiveness big-time. I 
>  tested Peters stuff together with Fenguangs additions and it looked 
>  promising. Therefore I was very happy to see Peters stuff going into 
>  2.6.24 and waited eagerly for rc1. In short, I am impressed. This 
>  really looks good. IO throughput is great and I could not reproduce 
>  the responsiveness problems so far.
> 
>  Below are a some numbers of my brute-force I/O tests that I can use 
>  to bring responsiveness down. My platform is a HP/DL380g4, dual CPUs, 
>  HT-enabled, 8 GB Memory, SmartaArray6i controller with 4x72GB SCSI 
>  disks as RAID5 (battery protected writeback cahe enabled) and gigabit 
>  networking (tg3). User space is 64-bit RHEL4.3
> 
>  I am basically doing copies using "dd" with 1MB blocksize. Local 
>  Filesystem ist ext2 (noatime). IO-Scheduler is dealine, as it tends 
>  to give best results. NFS3 Server is a Sun/T2000/Solaris10. The tests 
>  are:
> 
> 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! Peter does know how to make stuff fast :) Now 
lets pick up some of Peter's other, previously discarded patches as well
:-)

Such as the rewritten reclaim (clockpro) patches:

  http://programming.kicks-ass.net/kernel-patches/page-replace/

The improve-swap-performance (swap-token) patches:

  http://programming.kicks-ass.net/kernel-patches/swap_token/

His enable-swap-over-NFS [and other complex IO transports] patches:

  http://programming.kicks-ass.net/kernel-patches/vm_deadlock/

And the concurrent pagecache patches:

  http://programming.kicks-ass.net/kernel-patches/concurrent-pagecache/

as a starter :-) I think the MM should get out of deep-feature-freeze 
mode - there's tons of room to improve :-/

	Ingo "runs and hides" Molnar
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