From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sagi Grimberg Subject: Re: RFC: Immediate data support for SRP Date: Mon, 20 Jul 2015 12:44:26 +0300 Message-ID: <55ACC2FA.8030202@dev.mellanox.co.il> References: <55A7CCF1.3080201@sandisk.com> <55ABCB34.1000506@dev.mellanox.co.il> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Or Gerlitz Cc: Bart Van Assche , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.org On 7/20/2015 12:43 AM, Or Gerlitz wrote: > On Sun, Jul 19, 2015 at 7:07 PM, Sagi Grimberg wrote: >> On 7/16/2015 6:25 PM, Bart Van Assche wrote: > >> I agree it would definitely help as the lack of immediate data >> emphasizes the additional latency of doing rdma reads. > > Sagi, do we have black box evidence from iSER showing notable > (results? setup?) IO latency improvement from using immediate data vs. > RDMA read? I've seen it. The LIO target has a better write performance due to ImmediateData. I also have a patch in the pipe that optimize the this flow at the target side which improves up to 40% for 512B-8K IOs. Sagi. -- 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