From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <James.Bottomley@SteelEye.com>
Subject: Re: [parisc-linux] Measuring kernel compile times on smp system.
Date: Thu, 27 Oct 2005 21:55:23 -0500
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To: Ryan Bradetich <rbradetich@uswest.net>
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On Wed, 2005-10-26 at 23:06 -0600, Ryan Bradetich wrote:
> K460-smp(3):
> 	cold		44m36.961s	93m25.844s	35m37.427s
> 	warm		44m19.736s	93m9.127s	35m49.683s
> 
> K460-smp(4):
> 	cold		41m59.795s	114m6.654s	46m20.045s
> 	warm		41m39.792s	114m29.156s	46m6.385s

that's pretty bad 3->4 scaling.

Could you just check that you don't have irqbalanced running.  On a K or
D system, it would cause great inefficiencies in interrupt rethrowing.

Thanks,

James


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