From: Andi Kleen <andi@firstfloor.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/7] Simple Performance Counters: x86_64 support
Date: 01 Aug 2007 12:53:45 +0200 [thread overview]
Message-ID: <p73ir7zplty.fsf@bingen.suse.de> (raw)
In-Reply-To: <11859243121617-git-send-email-clameter@sgi.com>
Christoph Lameter <clameter@sgi.com> writes:
> Export cycles_to_ns (after renaming the cycles_2_ns to cycles_to_ns to be
> conforming to other arches).
This function is broken in some cases (e.g Opteron with powernow or
AMD dual core or older Intel systems) and going away. The TSCs tick
with different frequencies on different CPU there. In general i would
recommend to only report cycles.
-Andi
next prev parent reply other threads:[~2007-08-01 9:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-31 23:25 [PATCH 2/7] Simple Performance Counters: x86_64 support Christoph Lameter
2007-08-01 10:53 ` Andi Kleen [this message]
2007-08-01 17:52 ` Christoph Lameter
2007-08-01 18:26 ` Andi Kleen
2007-08-01 18:29 ` Christoph Lameter
2007-08-01 18:40 ` Andi Kleen
2007-08-01 18:45 ` Christoph Lameter
2007-08-01 18:57 ` Andi Kleen
2007-08-01 18:58 ` Christoph Lameter
2007-08-01 19:15 ` Andi Kleen
2007-08-17 16:10 ` Mathieu Desnoyers
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