From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: disappointing speed with virtio_blk Date: Wed, 16 Apr 2008 20:40:55 -0300 Message-ID: <20080416234055.GA4869@dmt> References: <200804132304.44950.lists@egidy.de> <20080414002902.GA4546@dmt> <200804170105.50963.lists@egidy.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net To: Gerd von Egidy Return-path: Content-Disposition: inline In-Reply-To: <200804170105.50963.lists@egidy.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org On Thu, Apr 17, 2008 at 01:05:50AM +0200, Gerd von Egidy wrote: > Hi Marcelo, > > > virtio-blk is doing synchronous IO which blocks the guest CPU. > > > > This is especially bad for write intensive loads where the guest > > will hang in the host write throttling logic. > > > > In the meantime please try the following patch: > > > > http://www.mail-archive.com/kvm-devel@lists.sourceforge.net/msg14732.html > > Thank you for this hint. > > I tried it this evening with kvm 66 - which should include your patch, right? Hi Gerd, No its not included. The issue is being worked on. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone