Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e8a70af2 authored Sep 25, 2016 by Harish Chegondi Committed by Doug Ledford Oct 02, 2016

IB/hfi1: Adjust hardware buffering parameter



It was determined that 0x880 is a better value for hardware buffering,
use it.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

parent 50921be0

drivers/infiniband/hw/hfi1/chip.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -13385,9 +13385,9 @@ static void init_rbufs(struct hfi1_devdata *dd)
		/*
		* Give up after 1ms - maximum wait time.
		*
		* RBuf size is 148KiB. Slowest possible is PCIe Gen1 x1 at
		* RBuf size is 136KiB. Slowest possible is PCIe Gen1 x1 at
		* 250MB/s bandwidth. Lower rate to 66% for overhead to get:
		* 148 KB / (66% * 250MB/s) = 920us
		* 136 KB / (66% * 250MB/s) = 844us
		*/
		if (count++ > 500) {
		dd_dev_err(dd,

drivers/infiniband/hw/hfi1/chip.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -82,7 +82,7 @@
		*/
		#define CM_VAU 3
		/* HFI link credit count, AKA receive buffer depth (RBUF_DEPTH) */
		#define CM_GLOBAL_CREDITS 0x940
		#define CM_GLOBAL_CREDITS 0x880
		/* Number of PKey entries in the HW */
		#define MAX_PKEY_VALUES 16