From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=41497 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OF1G2-0005dc-M1 for qemu-devel@nongnu.org; Thu, 20 May 2010 04:37:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OEzlU-0008F9-H6 for qemu-devel@nongnu.org; Thu, 20 May 2010 03:02:37 -0400 Received: from mailgate.abc-digital.com ([62.206.40.27]:39231 helo=mailgate.albertbauer.com) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OEzlQ-0008EQ-Mh for qemu-devel@nongnu.org; Thu, 20 May 2010 03:01:55 -0400 Message-ID: <4BF4DE5D.1060506@polarzone.de> Date: Thu, 20 May 2010 09:01:49 +0200 From: Udo Lembke MIME-Version: 1.0 References: <0af691d779965663abdd7bc708c2ad7bce2f6da0.1273699506.git.mtosatti@redhat.com> <659C91C0-E58A-43F6-A262-A15613E84FD3@suse.de> <4BED70B3.50202@redhat.com> <679AB14D-A9CC-437E-932F-AC13CAC26BA5@suse.de> <4BED7220.9060203@siemens.com> <4BF3B5F9.6020901@polarzone.de> <4BF41025.9020107@redhat.com> <4BF443EA.3020405@polarzone.de> <4BF4D2E8.2090607@redhat.com> In-Reply-To: <4BF4D2E8.2090607@redhat.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms080706040002000502020303" Subject: [Qemu-devel] Re: [PATCH 10/12] kvm: enable smp > 1 List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms080706040002000502020303 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Avi Kivity schrieb: > On 05/19/2010 11:02 PM, Udo Lembke wrote: >>> Unrelated, what are your smp issues? >>> >> >> If i use one cpu i got a good io-performance: >> e.g. over 500MB/s at the profile "install" of the io-benchmark >> h2benchw.exe. >> ( aio=threads | SAS-Raid-0 | >> ftp://ftp.heise.de/pub/ct/ctsi/h2benchw.zip | hwbenchw.exe -p -w >> iotest 0) >> The same test but with two cpus gives results between 27 and 298 MB/s! >> >> Also in real life it's noticeable not only with an benchmark. I use a >> win-vm with two cpu for postscript-ripping and have a performance >> drop due to the bad io. > Hi, > What's your block device model? virtio or ide? in the test described before i used virtio, but the same happens with ide (but of course slightly different values). > > What does cpu usage look like on guest or host? On the guest it's looks like the io-process flap between the cpus. Windows show both cpus together are around 65% (less or more) , but if one CPU-usage rise, the other drop. On the host: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5386 root 20 0 1160m 1.0g 1552 R 109 13.5 1:23.58 kvm The guest is a win-xp, but the same happens in real life on a win2003. 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