From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ido Shamai Subject: Re: ib_read_lat question Date: Wed, 27 Feb 2013 10:46:35 +0200 Message-ID: <512DC7EB.1060309@dev.mellanox.co.il> References: <51265E60.1070609@opengridcomputing.com> <1828884A29C6694DAF28B7E6B8A823736F35235F@ORSMSX101.amr.corp.intel.com> <512668BF.4030908@opengridcomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <512668BF.4030908-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Steve Wise Cc: "Hefty, Sean" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Troy Leedberg List-Id: linux-rdma@vger.kernel.org On 2/21/2013 8:34 PM, Steve Wise wrote: > On 2/21/2013 12:27 PM, Hefty, Sean wrote: >>> ib_read_lat displays RTT latency, while the other lat programs display >>> RTT/2. Is this intended? Or is read_lat.c/print_report() missing a >>> divide-by-two? >> The tests should measure how long it takes the data to reach the >> destination. For writes/sends, that would be RTT/2. For reads, the >> destination is local, so you should want RTT. > > Guess that makes sense. > Yes, to me too. Thanks Sean -- 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