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 10:16:04 +0200 [thread overview]
Message-ID: <20060723081604.GD27566@kiste.smurf.noris.de> (raw)
In-Reply-To: <20060722173649.952f909f.akpm@osdl.org>
Hi,
Azndrew Morton:
> What is 2.6.17-test-1.29?
My test build; standard kernel during bisection.
> How do you know that 5d0cf410e94b1f1ff852c3f210d22cc6c5a27ffa caused this?
>
git bisect.
> Are you able to test the below? It should fix up the reporting.
>
Applied.
> Are you able to compare the present bootlog with the 2.6.17 bootlog?
>
Sure. The diff says:
checking TSC synchronization across 4 CPUs:
+CPU#0 had 748437 usecs TSC skew, fixed it up.
+CPU#1 had 748437 usecs TSC skew, fixed it up.
+CPU#2 had -748437 usecs TSC skew, fixed it up.
+CPU#3 had -748437 usecs TSC skew, fixed it up.
Brought up 4 CPUs
-migration_cost=4000,8000
+migration_cost=85,1724
... but apparently, that skew is not corrected.
These numbers do match the difference in observed "date" outputs.
--
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
- -
The first place you look for something
is the last place you'd expect to find it.
next prev parent reply other threads:[~2006-07-23 8:17 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 [this message]
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
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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