Messages in this thread | | | Date | Thu, 15 Nov 2007 18:31:49 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: High priority tasks break SMP balancer? |
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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?
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