From: Andi Kleen <ak@suse.de>
To: john stultz <johnstul@us.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: first bisection results in -mm3 [was: Re: 2.6.15-mm2: reiser3 oops on suspend and more (bonus oops shot!)]
Date: 16 Jan 2006 23:19:59 +0100 [thread overview]
Message-ID: <p738xtf24ts.fsf@verdi.suse.de> (raw)
In-Reply-To: <1137447763.27699.27.camel@cog.beaverton.ibm.com>
john stultz <johnstul@us.ibm.com> writes:
> > bus master activity: 00000000
> > states:
> > C1: type[C1] promotion[C2] demotion[--] latency[000] usage[00007790]
> > *C2: type[C2] promotion[--] demotion[C1] latency[010] usage[02310093]
>
> Hrmm. Interesting. I'm not aware of C2 causing TSC stalls. This may be
> in part why we don't disable the TSC earlier.
On the dual core athlons C1 occasionally loses some ticks (it's not a real stall) when going
in/out of HLT. Since the different cores have different HLT patterns depending on load
that causes them to drift against slowly each other, and it adds up over longer runtime.
Instead of adding lots of ugly checking code I would just check the CPUs like I do
in x86-64 and not use the TSC if the test fails. I believe the logic currently in there
handles all modern hardware that is 64bit capable correctly.
-Andi
next prev parent reply other threads:[~2006-01-16 22:19 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 23:55 2.6.15-mm2: reiser3 oops on suspend and more (bonus oops shot!) Mattia Dongili
2006-01-11 1:00 ` Andrew Morton
2006-01-11 10:00 ` Pavel Machek
2006-01-11 11:24 ` Mattia Dongili
2006-01-11 18:40 ` Mattia Dongili
2006-01-12 22:08 ` first bisection results in -mm3 [was: Re: 2.6.15-mm2: reiser3 oops on suspend and more (bonus oops shot!)] Mattia Dongili
2006-01-12 23:26 ` john stultz
2006-01-14 12:08 ` Mattia Dongili
2006-01-16 20:16 ` john stultz
2006-01-16 20:40 ` Mattia Dongili
2006-01-16 21:42 ` john stultz
2006-01-16 22:19 ` Andi Kleen [this message]
2006-01-16 22:41 ` john stultz
2006-01-17 16:43 ` Mattia Dongili
2006-01-17 16:45 ` Mattia Dongili
2006-01-17 0:49 ` john stultz
2006-01-17 17:49 ` Mattia Dongili
2006-01-17 19:11 ` john stultz
2006-01-17 22:49 ` Mattia Dongili
2006-01-18 10:47 ` Mattia Dongili
2006-01-24 22:27 ` john stultz
2006-01-24 23:04 ` Mattia Dongili
2006-01-24 23:48 ` john stultz
2006-01-25 0:12 ` john stultz
2006-01-25 18:12 ` Mattia Dongili
2006-01-11 10:02 ` 2.6.15-mm2: reiser3 oops on suspend and more (bonus oops shot!) Pavel Machek
2006-01-11 14:27 ` Mattia Dongili
2006-01-15 22:14 ` 2.6.15-mm3 bisection: git-xfs.patch makes reiserfs oops Mattia Dongili
2006-01-15 22:48 ` Nathan Scott
2006-01-15 23:22 ` Mattia Dongili
2006-01-16 9:29 ` Hans Reiser
2006-01-16 11:48 ` Christoph Hellwig
2006-01-16 15:50 ` Mattia Dongili
2006-01-17 3:27 ` Hans Reiser
2006-01-16 11:51 ` Mattia Dongili
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