Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757098AbYA2VcV (ORCPT ); Tue, 29 Jan 2008 16:32:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753190AbYA2VcI (ORCPT ); Tue, 29 Jan 2008 16:32:08 -0500 Received: from sj-iport-5.cisco.com ([171.68.10.87]:33597 "EHLO sj-iport-5.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752965AbYA2VcF (ORCPT ); Tue, 29 Jan 2008 16:32:05 -0500 X-IronPort-AV: E=Sophos;i="4.25,271,1199692800"; d="scan'208";a="10487459" To: James Bottomley Cc: Bart Van Assche , Linus Torvalds , Andrew Morton , Vladislav Bolkhovitin , FUJITA Tomonori , linux-scsi@vger.kernel.org, scst-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: Integration of SCST in the mainstream Linux kernel X-Message-Flag: Warning: May contain useful information References: <1201639331.3069.58.camel@localhost.localdomain> From: Roland Dreier Date: Tue, 29 Jan 2008 13:31:52 -0800 In-Reply-To: <1201639331.3069.58.camel@localhost.localdomain> (James Bottomley's message of "Tue, 29 Jan 2008 15:42:11 -0500") Message-ID: User-Agent: Gnus/5.1008 (Gnus v5.10.8) XEmacs/21.4.21 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 29 Jan 2008 21:31:52.0929 (UTC) FILETIME=[5D561510:01C862BE] Authentication-Results: sj-dkim-4; header.From=rdreier@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1201 Lines: 21 > . . STGT read SCST read . STGT read SCST read . > . . performance performance . performance performance . > . . (0.5K, MB/s) (0.5K, MB/s) . (1 MB, MB/s) (1 MB, MB/s) . > . iSER (8 Gb/s network) . 250 N/A . 360 N/A . > . SRP (8 Gb/s network) . N/A 421 . N/A 683 . > On the comparable figures, which only seem to be IPoIB they're showing a > 13-18% variance, aren't they? Which isn't an incredible difference. Maybe I'm all wet, but I think iSER vs. SRP should be roughly comparable. The exact formatting of various messages etc. is different but the data path using RDMA is pretty much identical. So the big difference between STGT iSER and SCST SRP hints at some big difference in the efficiency of the two implementations. - R. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/