OK, I put this into my 2.6.17 branch:
diff-tree 1db76c14d215c8b26024dd532de3dcaf66ea30f7 (from
032ebf2620ef99a4fedaa0f77dc2272095ac5863)
Author: Roland Dreier <[EMAIL PROTECTED]>
Date: Wed May 17 07:48:07 2006 -0700
IB/mthca: Make fw_cmd_doorbell default to 0
Setting fw_cmd_doorbell allows FW command to be queued using posted
writes instead of requiring polling on a "go" bit, so it should be a
performance boost. However, the option causes problems with at least
some device/firmware combinations, so set the default to 0 until we
understand what's going on better.
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c
b/drivers/infiniband/hw/mthca/mthca_cmd.c
index 1985b5d..798e13e 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -182,7 +182,7 @@ struct mthca_cmd_context {
u8 status;
};
-static int fw_cmd_doorbell = 1;
+static int fw_cmd_doorbell = 0;
module_param(fw_cmd_doorbell, int, 0644);
MODULE_PARM_DESC(fw_cmd_doorbell, "post FW commands through doorbell page if
nonzero "
"(and supported by FW)");
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