[ewg] the default CQ moderation parameters patch in OFED 1.3

[Or Gerlitz]

Hi Eli,

The patch below in OFED 1.3 does not check the device capabilities and hence
always fail on non connectx systems. Can you fix it such that we will not
get all those "why I we mthca0: failed to modify CQ params prints in the logs".

Other then that and maybe even more important... I understand that it hard codes
ipoib to ask for delivery of interrupt only after MAX (16 packets received, 10 us
elapsed since first packet received), correct? so every simple ping-pong test that
measures IPoIB latency under small packet rate will have now 10us added to its latency?

I wonder if we can come up with simple way-in-the-middle here.

thanks,

Or.
------------------------------------
Set default CQ moderation parameters

Set the default params to make sure they are applied. Otherwise
we get poor performance.

Signed-off-by: Eli Cohen <eli at mellanox.co.il>

Index: ofa_kernel-1.3/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
===================================================================
--- ofa_kernel-1.3.orig/drivers/infiniband/ulp/ipoib/ipoib_verbs.c	2007-11-19 18:05:29.000000000 +0200
+++ ofa_kernel-1.3/drivers/infiniband/ulp/ipoib/ipoib_verbs.c	2007-11-19 18:06:52.000000000 +0200
@@ -181,6 +181,9 @@
 		goto out_free_mr;
 	}

+	if (ib_modify_cq(priv->cq, 16, 10))
+		printk(KERN_INFO "%s: failed to modify CQ params\n", ca->name);
+
 	if (ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP))
 		goto out_free_cq;