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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ho Anton,<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'>My first question to you would be:<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'>WHY are you using WinPcap to receive UDP packets?<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'>This sounds like a job for a winsock application….<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=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mark Pizzolato<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-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> winpcap-users-bounces@winpcap.org [mailto:winpcap-users-bounces@winpcap.org] <b>On Behalf Of </b>Anton Tremsin<br><b>Sent:</b> Friday, January 28, 2011 11:50 AM<br><b>To:</b> winpcap-users@winpcap.org<br><b>Subject:</b> [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I hope someone can help my problem receiving packets in Windows7<br><br>I am sending data by UDP packets from an FPGA through 10GB card (Chelsio). Using VC++ 2010 to compile code to receive them. <br><br>All packets arrive, no losses seen, but the problem is with the proper <b>operation of pcap_setmintocopy() function.</b> <br><br><b>I send 64 packets with 8234 bytes each. Receiving them through pcp_next_ex() and I only get 31 packets (sometimes 62, sometimes 47, 50 packets) before the timeout occurs. After timeout the rest of the packets arrives. <br></b><br>I set the minimum amount of data in the kernel buffer that causes a read from the application to return (unless the timeout expires) to be 1 byte or it to be all 8234x64 bytes, no difference. Looks like the setmintocpy function has no effect on my kernel buffer to be copied to my application. If I send another set of 64 packets - data arrives into pcp_next_ex(), still only in lamp of 31 (62, 47,50) packets <br><br>That is a big problem for my application.<br><br><b>Is there anything I am doing wrong or need to change something in the system/driver to make setmintocopy function to operate properly?<br></b><br>Thanks a lot for your help, <br><br>Anton Tremsin<br><br><br><o:p></o:p></p><pre>-- <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Anton S. Tremsin, Ph.D.<o:p></o:p></pre><pre>Space Sciences Laboratory<o:p></o:p></pre><pre>University of California at Berkeley<o:p></o:p></pre><pre>Berkeley, CA 94720<o:p></o:p></pre><pre>Tel: (510) 642 4554<o:p></o:p></pre></div></div></body></html>