Messages in this thread | | | Date | Sat, 02 Aug 2008 23:54:20 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] x86_64: Restore the proper NR_IRQS define so larger systems work. |
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Eric W. Biederman wrote: > Xen pv 64 will work at least as well with a larger definition for > NR_IRQS as it will work with a smaller definition, and since > NR_VECTORS is 256 we always have more irqs with the 32bit definition > we were mistakenly using. > > Xen has 1024 event channels so I expect 1024 would the nice number to > provide there. >
Yes, but really its overkill. It needs about 6 interrupts/cpu for normal system overhead (timer, IPI, things like that), and then some amount for virtual devices.
dom0 - the control domain - will need some number of events per other guest domain, so it can start feeling the pressure depending on how many domains and devices there are.
J
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