From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Date: Wed, 25 Mar 2009 11:54:03 +0000 Subject: Re: [PATCH] KVM: IA64: enable external interrupt in vmm Message-Id: <49CA1B5B.6090107@redhat.com> List-Id: References: <10C63FAD690C13458F0B32BCED571F140E29AF79@pdsmsx502.ccr.corp.intel.com> In-Reply-To: <10C63FAD690C13458F0B32BCED571F140E29AF79@pdsmsx502.ccr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ia64@vger.kernel.org Zhang, Yang wrote: > Avi Kivity wrote: > >> I'm surprised it doesn't work this way already. What happens now if >> the guest disables interrupts and spins? >> > when vmm disables interrupt, all the external interrupts are pending > until return back to the guest. and this will degrade the i/o performance. Oh I misunderstood. When the guest us running interrupts are enabled, this was true before. The change enables interrupts in the monitor, so it improves responsiveness. -- error compiling committee.c: too many arguments to function