From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 5/5] ioeventfd: Introduce KVM_IOEVENTFD_FLAG_SOCKET Date: Wed, 13 Jul 2011 15:57:07 +0300 Message-ID: <4E1D9623.70801@redhat.com> References: <1309927078-5983-1-git-send-email-levinsasha928@gmail.com> <1309927078-5983-5-git-send-email-levinsasha928@gmail.com> <20110706114203.GA18368@redhat.com> <1309964506.15123.13.camel@sasha> <20110706155135.GA21638@redhat.com> <1310276083.2393.6.camel@sasha> <20110710080559.GC1630@redhat.com> <1310469824.2393.22.camel@sasha> <4E1C2F59.90600@redhat.com> <4E1D442E.6090308@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Sasha Levin , "Michael S. Tsirkin" , kvm@vger.kernel.org, Ingo Molnar , Marcelo Tosatti To: Pekka Enberg Return-path: Received: from mx1.redhat.com ([209.132.183.28]:3805 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752027Ab1GMM5S (ORCPT ); Wed, 13 Jul 2011 08:57:18 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 07/13/2011 11:02 AM, Pekka Enberg wrote: > On Wed, Jul 13, 2011 at 10:07 AM, Avi Kivity wrote: > > - the writes are such high frequency that we gain something from the > > queueing is happens when we thread work. That's where the gain for serial > > console can come from - though it would be better to just use virtio-serial > > instead. > > We'd like to keep 8250 emulation because it's the most robust method > for getting data out of the kernel when there's problems. It's also > compatible with earlyprintk and such. What do you hope to gain from the optimization? 100ms less boot time? btw, it likely needs read support, if any read can depend on a previous write. -- error compiling committee.c: too many arguments to function