From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Vivier Subject: Re: Performance comparaison with dbench on KVM Date: Fri, 25 May 2007 13:51:35 +0200 Message-ID: <4656CDC7.2050700@bull.net> References: <46559FDF.5000609@bull.net> <4655A307.3080707@codemonkey.ws> <4655A4BA.5080108@bull.net> <4655E496.3080003@codemonkey.ws> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0652090932==" Cc: kvm-devel To: Anthony Liguori Return-path: In-Reply-To: <4655E496.3080003-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============0652090932== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig5B5E160E44B79A60BCC40A88" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig5B5E160E44B79A60BCC40A88 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Anthony Liguori wrote: > Laurent Vivier wrote: >> Anthony Liguori wrote: >> Hi Anthony, >> >> I didn't modify aio_init limit... >> =20 >=20 > It would be pretty useful to give it a try. In qemu_aio_init() where > aio_init() get's called. If you just bump aio_threads and aio_num from= > 1 to, say, 32. You should see a big difference in SCSI performance. >=20 I made some tests as you explained, but results are worst. with: ai.aio_threads =3D 32; ai.aio_num =3D 32; I have: KVM-25 + SCSI + aio_init(32 threads) Throughput 332.305 MB/sec 1 procs Throughput 316.832 MB/sec 2 procs Throughput 246.741 MB/sec 4 procs Throughput 142.115 MB/sec 8 procs Throughput 107.227 MB/sec 16 procs Throughput 54.6614 MB/sec 32 proc Throughput 21.3738 MB/sec 64 procs Laurent --=20 ------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org -------------- "Any sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clarke --------------enig5B5E160E44B79A60BCC40A88 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.7 (GNU/Linux) iD8DBQFGVs3L9Kffa9pFVzwRAuBoAJ4k68Oa+fzl6WWbJXvjZdPl0fzu7ACeKWQI z3geNJcQLKtpvW682JPPeX8= =HEOE -----END PGP SIGNATURE----- --------------enig5B5E160E44B79A60BCC40A88-- --===============0652090932== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ --===============0652090932== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --===============0652090932==--