From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [PATCH 5/5] IB/srp: Optimize completion queue polling Date: Fri, 04 Jul 2014 12:48:42 +0200 Message-ID: <53B6868A.3070705@acm.org> References: <53B55E55.5040907@acm.org> <53B55F1F.6000704@acm.org> <1404407103.32754.3.camel@haswell.thedillows.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1404407103.32754.3.camel-a7a0dvSY7KqLUyTwlgNVppKKF0rrzTr+@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: David Dillow Cc: Roland Dreier , Sagi Grimberg , Sebastian Parschauer , linux-rdma List-Id: linux-rdma@vger.kernel.org On 07/03/14 19:05, David Dillow wrote: > When we looked at this back in the 2.6.38 time-frame, there were several > performance anomalies with this -- and an block-iopoll conversion -- and > IIRC, neither was a win. It's possible that the issues were specific to > the drivers and that newer hardware is better, but it'd be good to see > the numbers. Hello Dave, Do you still have that measurement data available and/or the scripts that were used to collect that data ? I'd like to have a look at which test you ran such that I can repeat that test with Linus' master tree. A lot has been changed since kernel 2.6.38 was released, e.g. several more SCSI core and SRP initiator driver optimizations have been accepted upstream since then. I have found an e-mail from you from 2010 with measurement data attached in an .ods document but it's probably not that e-mail that you are referring to (http://www.spinics.net/lists/linux-scsi/msg49216.html). Thanks, Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html