From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erez Zilber Subject: Re: Performance of SCST versus STGT Date: Thu, 17 Jan 2008 16:46:22 +0200 Message-ID: <478F6A3E.6020301@Voltaire.COM> References: <20080117184052F.fujita.tomonori@lab.ntt.co.jp> <478F246C.4040400@vlnb.net> <20080117190558K.fujita.tomonori@lab.ntt.co.jp> <478F64A0.6020201@Voltaire.COM> <478F6708.30604@vlnb.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <478F6708.30604-d+Crzxg7Rs0@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: stgt-devel-bounces-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org Errors-To: stgt-devel-bounces-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org To: Vladislav Bolkhovitin Cc: stgt-devel-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org, linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, James.Bottomley-JuX6DAaQMKPCXq6kfMZ53/egYHeGw8Jk@public.gmane.org, FUJITA Tomonori , scst-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-scsi@vger.kernel.org >> We didn't run any real performance test with tgt, so I don't have >> numbers yet. I know that Pete got ~900 MB/sec by hacking sgp_dd, so all >> data was read/written to the same block (so it was all done in the >> cache). Pete - am I right? >> >> As already mentioned, he got that with IB SDR cards that are 10 Gb/sec >> cards in theory (actual speed is ~900 MB/sec). With DDR cards (20 >> Gb/sec), you can get even more. I plan to test that in the near future. > > Are you writing about a maximum possible speed which he got, including > multithreded tests with many outstanding commands or about speed he > got on single threaded reads with one outstanding command? This > thread is about the second one. > As I said, we didn't run any performance tests on stgt yet. Erez