From mboxrd@z Thu Jan 1 00:00:00 1970 From: Emmanuel Lacour Subject: Re: virtio_net hang Date: Tue, 18 Nov 2008 19:37:57 +0100 Message-ID: <20081118183756.GP1897@easter-eggs.com> References: <20081113122709.GB14254@easter-eggs.com> <1226589153.19068.7.camel@blaa> <20081113152452.GI14254@easter-eggs.com> <20081114092339.GC11961@easter-eggs.com> <1226687204.9332.113.camel@blaa> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: kvm@vger.kernel.org Return-path: Received: from volubilis.easter-eggs.org ([212.85.154.90]:34822 "EHLO volubilis.easter-eggs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752105AbYKRSh7 (ORCPT ); Tue, 18 Nov 2008 13:37:59 -0500 Received: from localhost (localhost [127.0.0.1]) by volubilis.easter-eggs.org (Postfix) with ESMTP id BAB2D2432E for ; Tue, 18 Nov 2008 19:37:58 +0100 (CET) Received: from datura.easter-eggs.fr (vbo91-5-88-186-16-26.fbx.proxad.net [88.186.16.26]) by volubilis.easter-eggs.org (Postfix) with ESMTP id 65D262432D for ; Tue, 18 Nov 2008 19:37:58 +0100 (CET) Content-Disposition: inline In-Reply-To: <1226687204.9332.113.camel@blaa> Sender: kvm-owner@vger.kernel.org List-ID: On Fri, Nov 14, 2008 at 06:26:44PM +0000, Mark McLoughlin wrote: > > Right, the tap device tx queue is full because kvm-userspace isn't > reading packets from it. > > This could be because kvm-userspace has just stopped noticing that > there's data available from the tapfd or because virtio_net in the guest > has stopped noticing that packets are available in the ring. > > One thing you could easily check is whether: > > ip link set eth0 down > ip link set eth0 up > > in the host is sufficient to fix it? If it is, then it points to a guest > driver issue. > I made the test, putting link down then up fix it. So what can I do next time to help fixing this ?