From: "Ray Bryant" <raybry@mpdtxmail.amd.com>
To: "Daniel Jacobowitz" <dan@debian.org>
Cc: "john stultz" <johnstul@us.ibm.com>, "Andi Kleen" <ak@suse.de>,
"Andrew Morton" <akpm@osdl.org>,
"lkml" <linux-kernel@vger.kernel.org>,
discuss@x86-64.org
Subject: Re: [discuss] Re: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs
Date: Wed, 21 Sep 2005 10:15:08 -0500 [thread overview]
Message-ID: <200509211015.09356.raybry@mpdtxmail.amd.com> (raw)
In-Reply-To: <20050921040342.GA7175@nevyn.them.org>
On Tuesday 20 September 2005 23:03, Daniel Jacobowitz wrote:
>
> FYI, at least I have reproduced this without powernow loaded.
There are cases that we are aware of where the TSC will count slower while the
processor is halted. This can make TSC's get out of sync on dual cores.
I wonder if you can reproduce this problem while also running a pair of cpu
bound tasks on your dual core box. If you can't, then this is the culprit.
In general, however, on multisocket systems, you can't depend on TSC's being
synchronized between sockets, so all of this is moot. We just have to deal
with it.
--
Ray Bryant
AMD Performance Labs Austin, Tx
512-602-0038 (o) 512-507-7807 (c)
next prev parent reply other threads:[~2005-09-21 14:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-19 19:16 [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs john stultz
2005-09-19 19:31 ` Andi Kleen
2005-09-19 19:42 ` john stultz
2005-09-19 19:49 ` [discuss] " Andi Kleen
2005-09-20 18:59 ` john stultz
2005-09-21 4:03 ` Daniel Jacobowitz
2005-09-21 15:15 ` Ray Bryant [this message]
2005-09-21 15:04 ` Andi Kleen
2005-09-21 15:46 ` Ray Bryant
2005-09-22 8:00 ` Jonas Oreland
2005-09-21 20:17 ` Andrew Morton
2005-10-07 12:26 ` Vladimir B. Savkin
2005-10-07 12:31 ` Andi Kleen
2005-10-07 14:15 ` Vladimir B. Savkin
2005-10-07 14:21 ` [discuss] " Velu Erwan
2005-10-08 10:11 ` Vladimir B. Savkin
2005-10-10 18:03 ` john stultz
2005-10-10 18:12 ` Vladimir B. Savkin
2005-10-10 18:19 ` Jonas Oreland
2005-10-11 7:35 ` Vladimir B. Savkin
2005-10-11 8:06 ` Andi Kleen
2005-10-11 16:27 ` Jonas Oreland
2005-10-25 7:35 ` x86-64: Syncing dualcore cpus TSCs Jonas Oreland
2005-10-25 7:42 ` Andi Kleen
2005-10-26 0:05 ` David Lang
-- strict thread matches above, loose matches on Subject: below --
2005-09-20 19:13 [discuss] Re: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs Langsdorf, Mark
2005-09-20 19:24 ` Scott Lampert
2005-09-20 19:30 ` john stultz
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