From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Richard Croucher" Subject: Re: iWARP tuning Date: Fri, 4 Mar 2011 08:59:45 -0000 Message-ID: <005701cbda4a$82f9b8b0$88ed2a10$@com> References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1808830092==" Return-path: In-Reply-To: Content-Language: en-gb List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org Errors-To: ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org To: 'Tanin' , 'linux-rdma' , ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org List-Id: linux-rdma@vger.kernel.org This is a multi-part message in MIME format. --===============1808830092== Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01CBDA4A.82F9B8B0" Content-Language: en-gb This is a multi-part message in MIME format. ------=_NextPart_000_0058_01CBDA4A.82F9B8B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Is your NIC using TOE or a kernel based TCP/IP stack. TCP requires the window size to match the B/W delay product. By default, it is only set to support high B/W LAN or low B/W WAN. If you have a high B/W WAN, which you would need for RDMA, then you need to increase the TCP buffers and window size settings accordingly. If it is TOE, then you will be constrained by whether they expose these settings and whether there is sufficient memory on the card to reach your B/W delay product. From: ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org [mailto:ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org] On Behalf Of Tanin Sent: 04 March 2011 01:21 To: linux-rdma; ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org Subject: [ewg] iWARP tuning Dear all, We had conducted some tests on long distance data transfer using iWARP. But the performance is bad. Does anyone has some idea on how to tune the iWARP for better performance? Does iWARP support paralell data transfer? Does the buffer size of the card tunable? Thanks! -- Best regards, ---------------------------------------------------------------------------- ------------------- Li, Tan PhD Candidate & Research Assistant, Electrical Engineering, Stony Brook University, NY Personal Web Site: https://sites.google.com/site/homepagelitan/Home Email: fanqielee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ------=_NextPart_000_0058_01CBDA4A.82F9B8B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Is your NIC using TOE or a kernel based TCP/IP = stack.

 

TCP requires the window size to match the B/W delay product.  By = default, it is only set to support high B/W LAN or low B/W = WAN.   If you have a high B/W WAN, which you would need for = RDMA, then you need to increase the TCP buffers and window size settings = accordingly.   If it is TOE, then you will be constrained by =  whether they expose these settings and whether there is sufficient = memory on the card to  reach your B/W delay = product.

 

From:= = ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org = [mailto:ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org] On Behalf Of = Tanin
Sent: 04 March 2011 01:21
To: linux-rdma; = ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org
Subject: [ewg] iWARP = tuning

 

Dear = all,

 

         &= nbsp;  We had conducted some tests on long distance data transfer = using iWARP. But the performance is bad. Does anyone has some idea = on how to tune the iWARP for = better performance? Does iWARP support paralell data = transfer? Does the buffer size of the card = tunable?

 

Thanks!

 



--

Best regards,

 

-------------------------------------------------------= ----------------------------------------
Li, = Tan
PhD Candidate & Research Assistant,
Electrical = Engineering,
Stony Brook University, NY

Personal Web Site: https://sites.google.com/site/homepagelitan/Home
Email: fanqielee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

 

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