From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cyrill Gorcunov Subject: Re: native kvm tool hrtimer problem Date: Thu, 8 Mar 2012 19:13:53 +0400 Message-ID: <20120308151353.GD21812@moon> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Daniele Carollo , kvm@vger.kernel.org, Asias He , Sasha Levin , Ingo Molnar To: Pekka Enberg Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:35635 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753561Ab2CHPN6 (ORCPT ); Thu, 8 Mar 2012 10:13:58 -0500 Received: by bkcik5 with SMTP id ik5so424061bkc.19 for ; Thu, 08 Mar 2012 07:13:57 -0800 (PST) Content-Disposition: inline In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On Thu, Mar 08, 2012 at 05:11:16PM +0200, Pekka Enberg wrote: > On Thu, Mar 8, 2012 at 4:32 PM, Daniele Carollo wrote: > > for an university study, I'm doing some network test between two vm > > using native linux kvm tool and connected via tap/virtio/vhost. > > When I run my script (several consecutive iperf tcp and udp > > execution), the first vm freeze with a message like: "hrtimer: > > interrupt took * ns". > > Is this a bug? (In order to complete the test i had to set the number > > of guest cpu to 1) > > > > Do you know what is the expected throughput between two vm using virtio/vhost? > > I don't really use the tap interface so lets CC Asias. Which guest > kernel are you using, btw? > Yup, Asias was using it, if my memory doesn't betray me. Also both -- host and guest kernel versions might be useful to know. iirc we were emulating rtc only while anything else passes through to kvm kernel driver. Cyrill