Re: Interrupt time inflation on Xen

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Mar 22, 2016 at 07:22:28PM -0400, Thor Lancelot Simon wrote:
> On Tue, Mar 22, 2016 at 01:28:06PM -0400, Greg Troxel wrote:
> > 
> > I wonder if this is a netbsd-7 vs netbsd-6 thing.  Or only triggered by
> > some interrupt mappings.
> 
> I'm wondering a few things:
> 
> Which version of Xen are the rest of you using?  I'm on 4.5.
> 
> Are the ATA drivers you're using still giant-locked, or are they now
> MPSAFE (I'm digging, but I'm at the end of a long thin network pipe
> today with only very old source trees on hand)?  Both the ciss and arcmsr
> where I've seen this problem are SCSI, and the SCSI subsystem takes
> KERNEL_LOCK.

(S)ATA is not MPSAFE

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--