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<TITLE>IBV_WC_RETRY_EXC_ERR causes</TITLE>
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<P><FONT SIZE=2 FACE="Arial">Can someone please explain what can cause IBV_WC_RETRY_EXC_ERR? I am using a combination of send-receive and RDMA. I have the reliable connection queue pairs initialized as:</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> qp_attr.timeout = 18;</FONT>
<BR><FONT SIZE=2 FACE="Arial"> qp_attr.retry_cnt = 7;</FONT>
<BR><FONT SIZE=2 FACE="Arial"> qp_attr.rnr_retry = 7;</FONT>
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<P><FONT SIZE=2 FACE="Arial">From the documentation, I assumed a value of 7 meant infinite retry. Can lack of receive buffers cause this error? I understand IBV_WC_RNR_RETRY_EXC_ERR to be the error caused by lack of receive buffers. Could it be congestion in the network?</FONT></P>
<P><FONT SIZE=2 FACE="Arial">I could not find much from earlier queries related to this error. It often occurs in the middle of the computation on large (>=1024) processor counts, when I try to have multiple outstanding send-recvs between a pair of processes (each pair of processes has a RC queue pair initialized). I do not have a small test case yet that can repeat this error.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Thanks for any help,</FONT>
<BR><FONT SIZE=2 FACE="Arial">Sriram.K</FONT>
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