From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [RFC PATCH 00/17] virtual-bus Date: Thu, 02 Apr 2009 09:49:25 -0500 Message-ID: <49D4D075.9010702@codemonkey.ws> References: <20090331184057.28333.77287.stgit@dev.haskins.net> <87ab71monw.fsf@basil.nowhere.org> <49D35825.3050001@novell.com> <20090401132340.GT11935@one.firstfloor.org> <49D37805.1060301@novell.com> <20090401170103.GU11935@one.firstfloor.org> <49D3B64F.6070703@codemonkey.ws> <49D3D7EE.4080202@novell.com> <49D46089.5040204@redhat.com> <49D497A1.4090900@novell.com> <49D4A4EB.8020105@redhat.com> <49D4AE0C.3000604@novell.com> <49D4B2C0.5060906@redhat.com> <49D4B594.6080703@novell.com> <49D4B8B4.4020003@redhat.com> <49D4BF70.1060301@novell.com> <49D4C191.2070502@redhat.com> <49D4CAA7.3020004@novell.com> <49D4CC61.6010105@redhat.com> <49D4CEB1.9020001@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Gregory Haskins , Andi Kleen , linux-kernel@vger.kernel.org, agraf@suse.de, pmullaney@novell.com, pmorreale@novell.com, rusty@rustcorp.com.au, netdev@vger.kernel.org, kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from rv-out-0506.google.com ([209.85.198.233]:26310 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760533AbZDBOtg (ORCPT ); Thu, 2 Apr 2009 10:49:36 -0400 In-Reply-To: <49D4CEB1.9020001@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > Avi Kivity wrote: >> >> The alternative is to get a notification from the stack that the >> packet is done processing. Either an skb destructor in the kernel, >> or my new API that everyone is not rushing out to implement. > > btw, my new api is > > > io_submit(..., nr, ...): submit nr packets > io_getevents(): complete nr packets I don't think we even need that to end this debate. I'm convinced we have a bug somewhere. Even disabling TX mitigation, I see a ping latency of around 300ns whereas it's only 50ns on the host. This defies logic so I'm now looking to isolate why that is. Regards, Anthony Liguori