<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Is your NIC using TOE or a kernel based TCP/IP stack.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ewg-bounces@lists.openfabrics.org [mailto:ewg-bounces@lists.openfabrics.org] <b>On Behalf Of </b>Tanin<br><b>Sent:</b> 04 March 2011 01:21<br><b>To:</b> linux-rdma; ewg@lists.openfabrics.org<br><b>Subject:</b> [ewg] iWARP tuning<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Dear all,<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal> 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?<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Thanks!<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><br clear=all><br>-- <o:p></o:p></p></div><div><p class=MsoNormal>Best regards,<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>-----------------------------------------------------------------------------------------------<br>Li, Tan<br>PhD Candidate & Research Assistant, <br>Electrical Engineering, <br>Stony Brook University, NY<br><br>Personal Web Site: <a href="https://sites.google.com/site/homepagelitan/Home" target="_blank">https://sites.google.com/site/homepagelitan/Home</a><br><br>Email: <a href="mailto:fanqielee@gmail.com" target="_blank">fanqielee@gmail.com</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>