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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
Date: Mon, 13 Feb 2006 11:26:34 +0100	[thread overview]
Message-ID: <20060213102634.GA4677@osiris.boeblingen.de.ibm.com> (raw)

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

             reply	other threads:[~2006-02-13 10:26 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-02-13 10:26 Heiko Carstens [this message]
2006-02-13 10:34 ` David S. Miller
2006-02-13 10:54   ` Ingo Molnar
2006-02-13 20:57     ` David S. Miller
2006-02-13 10:46 ` Ingo Molnar
2006-02-13 16:13   ` Heiko Carstens
2006-02-13 23:42   ` Olaf Hering
2006-02-14  0:08     ` Olaf Hering
2006-02-14  8:09       ` Heiko Carstens
2006-02-14 10:56         ` Heiko Carstens
2006-02-14 12:35           ` Ingo Molnar
2006-02-14 12:37             ` Ingo Molnar
2006-02-16  6:27   ` Heiko Carstens

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