Date: Mon, 13 Feb 2006 11:26:34 +0100
From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Hannes Reinecke <hare@suse.de>, linux-kernel@vger.kernel.org
Subject: calibrate_migration_costs takes ages on s390
Message-ID: <20060213102634.GA4677@osiris.boeblingen.de.ibm.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: mutt-ng/devel (Linux)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 786
Lines: 16

The boot sequence on s390 sometimes takes ages and we spend a very long time
(up to one or two minutes) in calibrate_migration_costs. The time spent there
differs from boot to boot. Also the calculated costs differ a lot. I've seen
differences by up to a factor of 15 (yes, factor not percent).
Also I doubt that making these measurements make much sense on a completely
virtualized architecture where you cannot tell how much cpu time you will
get anyway.
Is there any workaround or fix available so we can avoid seeing this?

Thanks,
Heiko
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/