<html><body><p><font size="2">Hi Aaron,</font><br><br><font size="2">I just searched the core GPFS source code. I didn't find </font>TCP_QUICKACK<font size="2"> being used explicitly.</font><br><br><font size="2">Regards, The Spectrum Scale (GPFS) team<br><br>------------------------------------------------------------------------------------------------------------------<br>If you feel that your question can benefit other users of Spectrum Scale (GPFS), then please post it to the public IBM developerWroks Forum at <a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a>. <br><br>If your query concerns a potential software error in Spectrum Scale (GPFS) and you have an IBM software maintenance contract please contact 1-800-237-5511 in the United States or your local IBM Service Center in other countries. <br><br>The forum is informally monitored as time permits and should not be used for priority messages to the Spectrum Scale (GPFS) team.</font><br><br><img width="16" height="16" src="cid:1__=8FBB087BDFF9D88C8f9e8a93df938690918c8FB@" border="0" alt="Inactive hide details for "Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]" ---08/13/2018 02:48:53 PM---This is a question mostly f"><font size="2" color="#424282">"Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]" ---08/13/2018 02:48:53 PM---This is a question mostly for the devs. but really for anyone who can answer. Does GPFS use the TCP_</font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">"Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]" <aaron.s.knister@nasa.gov></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">gpfsug main discussion list <gpfsug-discuss@spectrumscale.org></font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">08/13/2018 02:48 PM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">[gpfsug-discuss] TCP_QUICKACK</font><br><font size="2" color="#5F5F5F">Sent by: </font><font size="2">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br>This is a question mostly for the devs. but really for anyone who can answer. <br><br>Does GPFS use the TCP_QUICKACK socket flag on Linux?<br><br>I’m debugging an IPoIB problem exacerbated by GPFS and based on the packet captures it seems as though the answer might be yes, but I’m curious if GPFS is explicitly doing this or if there’s just a timing window in the RPC behavior that just makes it look that way. <br><br>-Aaron<br><br><br><tt><font size="2">_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br></font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a></font></tt><tt><font size="2"><br></font></tt><br><br><BR>
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