X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 31FFF535A5 for ; Mon, 9 May 2005 12:40:13 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 37107-08 for ; Mon, 9 May 2005 15:40:12 +0000 (GMT) Received: from server07.icaen.uiowa.edu (server07.icaen.uiowa.edu [128.255.17.47]) by svr1.postgresql.org (Postfix) with ESMTP id BBEED5359D for ; Mon, 9 May 2005 12:40:11 -0300 (ADT) Received: from server11.icaen.uiowa.edu (server11.icaen.uiowa.edu [128.255.17.51]) by server07.icaen.uiowa.edu (8.13.3/8.12.9) with ESMTP id j49FeAV9008329; (envelope-from ) Mon, 9 May 2005 10:40:10 -0500 (CDT) Received: from [192.168.1.11] (12-215-118-172.client.mchsi.com [12.215.118.172]) (authenticated user=jfmeinel) by server11.icaen.uiowa.edu (8.13.2/smtp-serv-1.7) with ESMTP id j49Fe8J1013479 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256); (envelope-from ) Mon, 9 May 2005 10:40:09 -0500 (CDT) Message-ID: <427F8457.6000001@arbash-meinel.com> Date: Mon, 09 May 2005 10:40:07 -0500 From: John A Meinel User-Agent: Mozilla Thunderbird 1.0.2-1.3.2 (X11/20050324) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Anjan Dave Cc: Geoffrey , Mischa Sandberg , pgsql-performance@postgresql.org Subject: Re: Whence the Opterons? References: <4BAFBB6B9CC46F41B2AD7D9F4BBAF785026FF7D6@vt-pe2550-001.vantage.vantage.com> In-Reply-To: <4BAFBB6B9CC46F41B2AD7D9F4BBAF785026FF7D6@vt-pe2550-001.vantage.vantage.com> X-Enigmail-Version: 0.89.6.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigD7E9B7E06D7EDFB9ED088353" X-Virus-Scanned: ClamAV version 0.83, clamav-milter version 0.83 on clamav.icaen.uiowa.edu X-Virus-Scanned: ClamAV version 0.83, clamav-milter version 0.83 on clamav.icaen.uiowa.edu X-Virus-Status: Clean X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests= X-Spam-Level: X-Archive-Number: 200505/109 X-Sequence-Number: 12273 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigD7E9B7E06D7EDFB9ED088353 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Anjan Dave wrote: > Wasn't the context switching issue occurring in specific cases only? > > I haven't seen any benchmarks for a 50% performance difference. Neither > have I seen any benchmarks of pure disk IO performance of specific > models of Dell vs HP or Sun Opterons. > > Thanks, > Anjan > Well, I'm speaking more from what I remember reading, than personal testing. Probably 50% is too high, but I thought I remembered it being more general than just specific cases. I agree, though, that disk bandwidth is probably more important than CPU issues, though. And the extra 15k might get you a lot of disk performance. John =:-> --------------enigD7E9B7E06D7EDFB9ED088353 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFCf4RXJdeBCYSNAAMRAihvAJ9bMJp2/iDFuJscU1ZbTpJ18tgC2QCfTyLp WqVBCOLvUwFm742Jxz15Y84= =f1iO -----END PGP SIGNATURE----- --------------enigD7E9B7E06D7EDFB9ED088353--