Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spinwith irqs disable
From: Jeremy Fitzhardinge
Date: Mon Jul 07 2008 - 11:56:39 EST
Nick Piggin wrote:
Although, you wouldn't need to oversubscribe physical CPUs to hit
suboptimal behaviour.
Basically, I just ask for performance improvement to be measured
with some "realistic" configuration, then it should be easier to
justify.
Overcommitting cpus system-wide is pretty common. A use-case is
consolidating a pile of underused non-performance-critical servers into
one physical machine with a lot of VMs. It doesn't take much load to
cause a dhcp request to the dhcp server to steal a cpu away from the
mysql server while it holds a lock...
I'll mail out my patches so we can have a more concrete discussion shortly.
J
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