From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] strange performance behaviour with floats
Date: Thu, 20 Feb 2003 17:52:43 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805886@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709805852@msgid-missing>
>>>>> On Thu, 20 Feb 2003 09:35:02 +0100, Volker Birk <vb@ebios.de> said:
Volker> On Wed, Feb 19, 2003 at 11:09:36AM -0800, David Mosberger
Volker> wrote: Hello, I'm wondering about the strange behaviour of
Volker> the Linux scheduling on my rx5670:
>> Can you reproduce the behavior with a standard 2.4.xx ia64 kernel
>> (not with Red Hat's heavily patched kernel)?
Volker> That is a standard 2.4.xx ia64 kernel (with ia64 patches
Volker> from kernel.org).
Volker> bronto:~ # uname -a Linux bronto 2.4.19 #11 SMP Sat Nov 2
Volker> 18:47:02 CET 2002 ia64 GNU/Linux bronto:~ #
Hmmh, that's really strange. I assume you realize that your
test-program doesn't really do what the source code suggests (the
loop-body gets optimized away), but regardless the high variation
you're seeing seems wrong. Are you re-directing the kernel console to
a serial line? If so, make sure there is no logging activity when the
program runs slower (especially a slow baud-rate can "stall" the
kernel for non-trivial amounts of time).
--david
next prev parent reply other threads:[~2003-02-20 17:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-14 9:02 [Linux-ia64] strange performance behaviour with floats Volker Birk
2003-02-14 10:50 ` Hideki Yamamoto
2003-02-15 11:29 ` Volker Birk
2003-02-19 19:09 ` David Mosberger
2003-02-20 17:52 ` David Mosberger [this message]
2003-02-20 19:59 ` Volker Birk
2003-02-22 2:30 ` David Mosberger
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