From: Larry McVoy <lm@bitmover.com>
To: "David S. Miller" <davem@redhat.com>
Cc: mau@oscar.prima.de, linux-kernel@vger.kernel.org
Subject: Re: LMbench results for 2.5.40
Date: Tue, 1 Oct 2002 16:37:57 -0700 [thread overview]
Message-ID: <20021001163757.J13270@work.bitmover.com> (raw)
In-Reply-To: <20021001.161554.66190770.davem@redhat.com>; from davem@redhat.com on Tue, Oct 01, 2002 at 04:15:54PM -0700
> From: Patrick Mau <mau@oscar.prima.de>
> Date: Wed, 2 Oct 2002 00:08:54 +0200
>
> Could someone explain the results I marked with '???' ?
> The ones under 'Local Communication Bandwidth'.
By the way, the place you will probably see variance in LMbench is in the
context switch benchmarks, it's almost certainly due to randomness in
cache layout and there isn't a thing we can do about it. You can run a
zillion runs to get an average but please realize that is an *average*.
The context switch number are accurate, the low ones represent no cache
collisions and the high ones represent lots of cache collisions.
FYI. I don't like it either.
--
---
Larry McVoy lm at bitmover.com http://www.bitmover.com/lm
next prev parent reply other threads:[~2002-10-01 23:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-01 22:08 LMbench results for 2.5.40 Patrick Mau
2002-10-01 22:16 ` Jeff Garzik
2002-10-02 17:33 ` Patrick Mau
2002-10-08 19:04 ` Bill Davidsen
2002-10-02 17:38 ` Patrick Mau
2002-10-01 23:15 ` David S. Miller
2002-10-01 23:37 ` Larry McVoy [this message]
2002-10-08 18:55 ` Bill Davidsen
2002-10-08 19:07 ` Larry McVoy
2002-10-10 13:21 ` Bill Davidsen
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