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IB/qib: Default some module parameters optimally

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Minimize the need for users to have to set module parameters to get
good performance.

The following two parameters are changed:
 - rcvhdrcnt to twice the rcvegrcnt
 - pcie_caps=0x51

The rcvhdrcnt at twice the egrcount allows the preemptive NAK code
during reception to function in 100% of the cases rather than a sender
jiffies-based timeout.

The pcie_caps default of 0x51 will set the proposed MaxPayload and
MaxReceiveReqest to 256 and 4096 respectively.  The capabilities on
the root complex will be used to limit those values.

Reviewed-by: Ram Vepa <ram.vepa@qlogic.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mike Marciniszyn 2011-12-23 11:12:10 -05:00 committed by Roland Dreier
parent 4894710951
commit 8d4548f2b7
2 changed files with 3 additions and 3 deletions
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2
drivers/infiniband/hw/qib/qib_iba7322.c
View file

@ -3603,7 +3603,7 @@ static void qib_7322_config_ctxts(struct qib_devdata *dd)
if (qib_rcvhdrcnt)
dd->rcvhdrcnt = max(dd->cspec->rcvegrcnt, qib_rcvhdrcnt);
else
dd->rcvhdrcnt = max(dd->cspec->rcvegrcnt,
dd->rcvhdrcnt = 2 * max(dd->cspec->rcvegrcnt,
dd->num_pports > 1 ? 1024U : 2048U);
}

4
drivers/infiniband/hw/qib/qib_pcie.c
View file

@ -560,9 +560,9 @@ static int qib_tune_pcie_coalesce(struct qib_devdata *dd)
* BIOS may not set PCIe bus-utilization parameters for best performance.
* Check and optionally adjust them to maximize our throughput.
*/
static int qib_pcie_caps;
static int qib_pcie_caps = 0x51;
module_param_named(pcie_caps, qib_pcie_caps, int, S_IRUGO);
MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (4lsb), ReadReq (D4..7)");
MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
static int qib_tune_pcie_caps(struct qib_devdata *dd)
{