Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757877AbYBERBc (ORCPT ); Tue, 5 Feb 2008 12:01:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753192AbYBERBX (ORCPT ); Tue, 5 Feb 2008 12:01:23 -0500 Received: from fwil.voltaire.com ([193.47.165.2]:21665 "EHLO exil.voltaire.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751954AbYBERBW (ORCPT ); Tue, 5 Feb 2008 12:01:22 -0500 Message-ID: <47A89660.1080804@Voltaire.COM> Date: Tue, 05 Feb 2008 19:01:20 +0200 From: Erez Zilber User-Agent: Mozilla-Thunderbird 2.0.0.9 (X11/20080110) MIME-Version: 1.0 To: Bart Van Assche CC: FUJITA Tomonori , rdreier@cisco.com, James.Bottomley@hansenpartnership.com, torvalds@linux-foundation.org, akpm@linux-foundation.org, vst@vlnb.net, 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 References: <1201639331.3069.58.camel@localhost.localdomain> <20080130083239E.fujita.tomonori@lab.ntt.co.jp> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 05 Feb 2008 17:01:20.0456 (UTC) FILETIME=[BAEB8480:01C86818] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1060 Lines: 25 Bart Van Assche wrote: > On Jan 30, 2008 12:32 AM, FUJITA Tomonori wrote: > >> iSER has parameters to limit the maximum size of RDMA (it needs to >> repeat RDMA with a poor configuration)? >> > > Please specify which parameters you are referring to. As you know I > had already repeated my tests with ridiculously high values for the > following iSER parameters: FirstBurstLength, MaxBurstLength and > MaxRecvDataSegmentLength (16 MB, which is more than the 1 MB block > size specified to dd). > > Using such large values for FirstBurstLength will give you poor performance numbers for WRITE commands (with iSER). FirstBurstLength means how much data should you send as unsolicited data (i.e. without RDMA). It means that your WRITE commands were sent without RDMA. Erez -- 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/