Messages in this thread | | | Date | Wed, 6 Jun 2012 21:41:02 +0200 | From | Alexander Gordeev <> | Subject | Re: [PATCH 5/8] x86: apic: Try to spread IRQ vectors to different priority levels |
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On Wed, Jun 06, 2012 at 12:16:08PM -0700, Eric W. Biederman wrote: > Alexander Gordeev <agordeev@redhat.com> writes: > > > When assigning a new vector it is primarially done by adding 8 to the > > previously given out vector number. Hence, two consequently allocated > > vector numbers would likely fall into the same priority level. Try to > > spread vector numbers to different priority levels better by changing > > the step from 8 to 16. > > A weird goal. Given that linux ignores all priority levels internally > we would be better incrementing by 1. The practical problem is that > some older hardware would fail if you had more than two devices per > priority level.
Yes, the patch is aimed at those older hardware. For a newer hardware it will not bring any change.
But also to stop asking myself: why 8, not 1 or 16? :)
> Eric
-- Regards, Alexander Gordeev agordeev@redhat.com
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