On Mon, 2006-06-26 at 17:53 -0400, Pete Wyckoff wrote: > Using stock 2.6.17.1, with verbs 1.0.3-1.fc4 and mthca 1.0.2-1.fc4 > with MT25204, this line: > > ret = ibv_query_device(ctx, &hca_cap); > > tells me that hca_cap.max_sge = 30. > > However, this code fails, with the last kernel write returning EINVAL: > > memset(&att, 0, sizeof(att)); > att.send_cq = 1024; > att.recv_cq = 1024; > att.cap.max_recv_wr = 512; > att.cap.max_send_wr = 512; > att.cap.max_recv_sge = 30; > att.cap.max_send_sge = 30; > att.qp_type = IBV_QPT_RC; > qp = ibv_create_qp(pd, &att); > > But if I set: > > att.cap.max_recv_sge = 30; > att.cap.max_send_sge = 29; /* hca_cap.max_sge - 1 */ > > the QP create succeeds. > > Is this a known issue? Should I always subtract 1 from the reported > max on the send side? Just for this hardware?
Probably something else has a QP allocated? Like the SMA, maybe? -- Robert Walsh Email: [EMAIL PROTECTED] PathScale, Inc. Phone: +1 650 934 8117 2071 Stierlin Court, Suite 200 Fax: +1 650 428 1969 Mountain View, CA 94043.
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