linux-kernel - Re: AIM7 40% regression with 2.6.26-rc1

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Message-ID: <20080508073924.GA30356@elte.hu>
Date:	Thu, 8 May 2008 09:39:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: AIM7 40% regression with 2.6.26-rc1


* Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote:

> > great! Yanmin, could you please also check the other patch i sent 
> > (also attached below), does it solve the regression similarly?
>
> With your patch, aim7 regression becomes less than 2%. I ran the 
> testing twice.
> 
> Linus' patch could recover it completely. As aim7 result is quite 
> stable(usually fluctuating less than 1%), 1.5%~2% is a little big.

is this the old original aim7 you are running, or osdl-aim-7 or 
re-aim-7?

if it's aim7 then this is a workload that starts+stops 2000 parallel 
tasks that each start and exit at the same time. That might explain its 
sensitivity on the BKL - this is all about tty-controlled task startup 
and exit.

i could not get it to produce anywhere close to stable results though. I 
also frequently get into this problem:

  AIM Multiuser Benchmark - Suite VII Run Beginning
  Tasks    jobs/min  jti  jobs/min/task      real       cpu
   2000
  Failed to execute
          new_raph 200
  Unable to solve equation in 100 tries. P = 1.5708, P0 = 1.5708, delta = 6.12574e-17

  Failed to execute
          disk_cp /mnt/shm
  disk_cp (1): cannot open /mnt/shm/tmpa.common
  disk1.c: No such file or directory

  [.. etc. a large stream of them .. ]

system has 2GB of RAM and tmpfs mounted to the place where aim7 puts its 
work files.

	Ingo
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