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Date: Thu, 15 Nov 2007 18:31:49 -0800 (PST) From: Christoph Lameter <clameter@....com> To: Micah Dowty <micah@...are.com> cc: Kyle Moffett <mrmacman_g4@....com>, Cyrus Massoumi <cyrusm@....net>, LKML Kernel <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>, Mike Galbraith <efault@....de>, Paul Menage <menage@...gle.com> Subject: Re: High priority tasks break SMP balancer? On Thu, 15 Nov 2007, Micah Dowty wrote: > On all kernels I've tested from after your patch was committed, I can > reproduce a problem where a single high-priority thread which wakes up > very frequently can artificially inflate the SMP balancer's load > average for one CPU, causing other tasks to be migrated off that > CPU. The result is that this high-priority thread (which may only use > a few percent CPU) gets an entire CPU to itself. Even if there are > several busy-looping threads running, this CPU will be mostly idle. I am a bit at a loss as to how this could relate to the patch. This looks like a load balance logic issue that causes the load calculation to go wrong? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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