From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:49973) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R6mMU-0006ds-Bo for qemu-devel@nongnu.org; Thu, 22 Sep 2011 12:42:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1R6mMS-0003zw-TG for qemu-devel@nongnu.org; Thu, 22 Sep 2011 12:42:58 -0400 Received: from moutng.kundenserver.de ([212.227.126.171]:54608) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R6mMS-0003zi-IH for qemu-devel@nongnu.org; Thu, 22 Sep 2011 12:42:56 -0400 Message-ID: <4E7B6598.307@rdsoftware.de> Date: Thu, 22 Sep 2011 18:43:04 +0200 From: Erik Rull MIME-Version: 1.0 References: <0NZZCL-1R6MRY0ITD-0002EJ@icpu820.kundenserver.de> <1316635372.4443.104.camel@bling.home> In-Reply-To: <1316635372.4443.104.camel@bling.home> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Enabling Hyperthreading for Guest List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alex Williamson Cc: qemu-devel@nongnu.org Alex Williamson wrote: > See the extended -smp options: > > -smp n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets] > set the number of CPUs to 'n' [default=1] > maxcpus= maximum number of total cpus, including > offline CPUs for hotplug, etc > cores= number of CPU cores on one socket > threads= number of threads on one CPU core > sockets= number of discrete sockets in the system > > Try something like: > > -smp 4,cores=2,threads=2,sockets=1 > > Alex > Great - the correct combination made it :-) But the SMP-Performance-Benchmark is horrible :-( "Only" between 0.35 and 1.05 for the above combination. I have the same architecture on the host (2 cores w/ ht enabled) so there are enough real cores available for computation. Any idea what could slow down the performance here? Best regards, Erik