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From: Matthias Urlichs <smurf@smurf.noris.de>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, johnstul@us.ibm.com,
	torvalds@osdl.org, bunk@stusta.de, lethal@linux-sh.org,
	hirofumi@mail.parknet.co.jp
Subject: Re: REGRESSION: the new i386 timer code fails to sync CPUs
Date: Sun, 23 Jul 2006 14:58:15 +0200	[thread overview]
Message-ID: <20060723125815.GB7776@kiste.smurf.noris.de> (raw)
In-Reply-To: <20060723053755.0aaf9ce0.akpm@osdl.org>

Hi,

Andrew Morton:
> Also the sched-domain migration costs are grossly different between the two
> kernels.  Maybe we changed the migration-cost-estimation code; I forget.
> 
The old values look suspicious. 4000 and 8000 ??

Maybe there was some excess delay or wait time in the estimator.

The only code in the kernel I'd accept to take exactly 4000 of *anything*
without further investigation is a call to "mdelay(4)".  ;-)

-- 
Matthias Urlichs   |   {M:U} IT Design @ m-u-it.de   |  smurf@smurf.noris.de
Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de
 - -
Silence is the element in which great things fashion themselves.
		-- Thomas Carlyle

  reply	other threads:[~2006-07-23 12:59 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-22 23:36 REGRESSION: the new i386 timer code fails to sync CPUs Matthias Urlichs
2006-07-23  0:36 ` Andrew Morton
2006-07-23  8:16   ` Matthias Urlichs
2006-07-23 11:46     ` Andrew Morton
2006-07-23 12:08       ` Matthias Urlichs
2006-07-23 12:37         ` Andrew Morton
2006-07-23 12:58           ` Matthias Urlichs [this message]
2006-07-24 15:52           ` Siddha, Suresh B
2006-07-24 15:58           ` john stultz
2006-07-24 17:17             ` Matthias Urlichs
2006-07-24 17:51               ` Andi Kleen
2006-07-24 20:54                 ` john stultz
2006-07-30  9:03                   ` Andrew Morton
2006-07-30  9:49                     ` Matthias Urlichs
2006-07-30 20:10                     ` Andi Kleen
2006-07-30 20:55                       ` Andrew Morton
2006-07-30 21:13                       ` Matthias Urlichs
2006-07-30 21:20                         ` Arjan van de Ven
2006-07-30 21:55                           ` Matthias Urlichs
2006-08-01  1:47                             ` Siddha, Suresh B
2006-08-01  3:14                               ` Matthias Urlichs
2006-07-30 21:57                         ` Andi Kleen
2006-07-30 22:28                           ` Matthias Urlichs
2006-07-31 14:24                     ` Matthias Urlichs
2006-07-24 17:39             ` Andi Kleen

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