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<TITLE>RE: [PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun</TITLE>
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<P><FONT SIZE=2>Hi,</FONT>
<BR><FONT SIZE=2>We found an issue with the FW that causing this overrun.</FONT>
<BR><FONT SIZE=2>The bug happened when incrementing CQ consumer index in more then 1 and a CQE is written at the same time on this CQ.</FONT>
<BR><FONT SIZE=2>This bug is the same in 3.3.1 and 4.6.1 versions.</FONT>
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<P><FONT SIZE=2>A FW with a fix will be provided next week.</FONT>
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<P><FONT SIZE=2>Tziporet</FONT>
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<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Michael S. Tsirkin [<A HREF="mailto:mst@mellanox.co.il">mailto:mst@mellanox.co.il</A>]</FONT>
<BR><FONT SIZE=2>Sent: Wednesday, December 22, 2004 11:21 PM</FONT>
<BR><FONT SIZE=2>To: Roland Dreier</FONT>
<BR><FONT SIZE=2>Cc: openib-general@openib.org</FONT>
<BR><FONT SIZE=2>Subject: Re: [PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun</FONT>
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<P><FONT SIZE=2>Hello!</FONT>
<BR><FONT SIZE=2>Quoting r. Roland Dreier (roland@topspin.com) "Re: [PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun":</FONT>
<BR><FONT SIZE=2>> Roland> Testing on PCI Express/Arbel systems (with dual 3.2 GHz</FONT>
<BR><FONT SIZE=2>> Roland> Xeons) with FW 4.5.3, I've seen somewhat different</FONT>
<BR><FONT SIZE=2>> Roland> behavior. Even after setting IPOIB_NUM_WC to 1 so that</FONT>
<BR><FONT SIZE=2>> Roland> IPoIB never polls more than 1 CQE at a time (and so we</FONT>
<BR><FONT SIZE=2>> Roland> always inc the CI by exactly 1), I still get the CQ</FONT>
<BR><FONT SIZE=2>> Roland> overrun.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> FW 4.6.1 on these systems behaves the way Tavor FW 3.3.1 did on my</FONT>
<BR><FONT SIZE=2>> systems: if I modify IPoIB to always poll 1 CQE at a time, it works</FONT>
<BR><FONT SIZE=2>> fine. If IPoIB polls more than 1 CQE at a time then we see an</FONT>
<BR><FONT SIZE=2>> overrun.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> - Roland</FONT>
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<P><FONT SIZE=2>Thanks, Roland!</FONT>
<BR><FONT SIZE=2>I'll be working on it.</FONT>
<BR><FONT SIZE=2>mst</FONT>
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