Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 3761E650439 for ; Tue, 8 Jul 2008 06:49:48 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 49082-03 for ; Tue, 8 Jul 2008 06:49:38 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from nabagan.bluegap.ch (nabagan.bluegap.ch [88.198.58.248]) by postgresql.org (Postfix) with ESMTP id 33EC764FFDC for ; Tue, 8 Jul 2008 06:49:40 -0300 (ADT) Received: from [192.168.0.238] (berlin.programmfabrik.de [::ffff:213.221.101.147]) (AUTH: CRAM-MD5 markus@bluegap.ch) by nabagan.bluegap.ch with esmtp; Tue, 08 Jul 2008 11:49:36 +0200 id 00940C21.48733831.00007337 Message-ID: <48733830.3030509@bluegap.ch> Date: Tue, 08 Jul 2008 11:49:36 +0200 From: Markus Wanner User-Agent: Thunderbird 2.0.0.14 (X11/20080505) MIME-Version: 1.0 To: "Jonah H. Harris" CC: Merlin Moncure , Jeffrey Baker , "pgsql-performance@postgresql.org" Subject: Re: Fusion-io ioDrive References: <36e682920807020441h11abd344j9c510722189cb3a2@mail.gmail.com> <36e682920807070809lbce9225wd1c67978d063dd01@mail.gmail.com> In-Reply-To: <36e682920807070809lbce9225wd1c67978d063dd01@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200807/67 X-Sequence-Number: 30667 Hi, Jonah H. Harris wrote: > I'm not sure how those cards work, but my guess is that the CPU will > go 100% busy (with a near-zero I/O wait) on any sizable workload. In > this case, the current pgbench configuration being used is quite small > and probably won't resemble this. I'm not sure how they work either, but why should they require more CPU cycles than any other PCIe SAS controller? I think they are doing a clever step by directly attaching the NAND chips to PCIe, instead of piping all the data through SAS or (S)ATA (and then through PCIe as well). And if the controller chip on the card isn't absolutely bogus, that certainly has the potential to reduce latency and improve throughput - compared to other SSDs. Or am I missing something? Regards Markus