Messages in this thread | | | Date | Mon, 29 Jun 2009 09:20:47 +0200 | From | Ingo Molnar <> | Subject | Re: [RFC patch] Use IPI_shortcut for lapic timer broadcast |
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* Luming Yu <luming.yu@gmail.com> wrote:
> Hello, > > We need to use IPI shortcut to send lapic timer broadcast > to avoid the latency of sending IPI one bye one on systems with many > logical processors when NO_HZ is disabled. > Without this patch,I have seen upstream kernel with RHEL 5 kernel > config boot hang .
hm, that might be a valid optimization - but why does the lack of this optimization result in a hang?
Ingo
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