From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerd von Egidy Subject: Re: disappointing speed with virtio_blk Date: Sun, 13 Apr 2008 23:55:39 +0200 Message-ID: <200804132355.41342.lists@egidy.de> References: <200804132304.44950.lists@egidy.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Charles Duffy To: kvm-devel@lists.sourceforge.net Return-path: In-Reply-To: Content-Disposition: inline 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 Hi Charles, thanks for the quick reply. > My understanding is that virtio is very latency-sensitive. Do you know > whether your system is configured for high-resolution timer support, and > (more to the point) which clock source KVM is using on your host? On the host: > grep "Clock Event Device" /proc/timer_list Clock Event Device: hpet Clock Event Device: lapic Clock Event Device: lapic Within the vm: > grep "Clock Event Device" /proc/timer_list Clock Event Device: pit Clock Event Device: lapic Host and vm use the same kernel, CONFIG_HIGH_RES_TIMERS=y How do I find out which clock source KVM is using? Kind regards, Gerd -- Address (better: trap) for people I really don't want to get mail from: james@cactusamerica.com ------------------------------------------------------------------------- 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