From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: passthrough: improve interrupt injection locking Date: Fri, 23 Oct 2015 13:45:21 +0100 Message-ID: <1445604321.2374.148.camel@citrix.com> References: <1445598322-22154-1-git-send-email-david.vrabel@citrix.com> <1445603845.2374.140.camel@citrix.com> <562A2A63.2060207@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1Zpbiv-0004rj-RN for xen-devel@lists.xenproject.org; Fri, 23 Oct 2015 12:45:33 +0000 In-Reply-To: <562A2A63.2060207@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: David Vrabel , xen-devel@lists.xenproject.org Cc: Jan Beulich List-Id: xen-devel@lists.xenproject.org On Fri, 2015-10-23 at 13:38 +0100, David Vrabel wrote: > On 23/10/15 13:37, Ian Campbell wrote: > > On Fri, 2015-10-23 at 12:05 +0100, David Vrabel wrote: > > > When injecting an interrupt for a passthrough device into a guest, > > > the > > > per-domain event_lock is held, reducing performance when a guest has > > > many VCPUs and high interrupt rates. > > > > Did you CC me due to a possible impact on ARM? If so then I think since > > ARM > > lacks this "dpci" stuff none of these changes should have any impact on > > that arch. > > > > If you think I've missed something or you CCd me for some other reason > > please let me know. > > This series seems to fall into "THE REST" category. Ah, only Jan and I were CCd so I didn't think of that. I think despite the paths this ends up being x86 specific, so I'll leave it to Jan. Ian.