Re: xennet performance collapses with multiple vCPU

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

Hello,

On Mon, Apr 13, 2020 at 04:01:39PM +0000, Andrew Doran wrote:
> [...]
> This confirms my suspicion and is why I wanted to play with HZ.  I think
> soft interrupt processing is being driven off the clock interrupt.  Maybe
> hardware interrupt processing but I think that's less likely.  Native x86
> configured the same way does not behave like this.  Hmm.  I will play around
> with it some more.

I did some checks in this area; including KASSERT() in idle_block() that
that ci_ipending is 0 before and after sleeping.

I wonder if it could be an issue with IPIs instead.

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