From: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Cc: Harish Chegondi
<harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Dean Luick <dean.luick-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: [PATCH 10/13] IB/hfi1: Adjust hardware buffering parameter
Date: Sun, 25 Sep 2016 07:42:01 -0700 [thread overview]
Message-ID: <20160925144159.10261.85155.stgit@scvm10.sc.intel.com> (raw)
In-Reply-To: <20160925143656.10261.85231.stgit-9QXIwq+3FY+1XWohqUldA0EOCMrvLtNR@public.gmane.org>
From: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
It was determined that 0x880 is a better value for hardware buffering,
use it.
Reviewed-by: Dean Luick <dean.luick-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
drivers/infiniband/hw/hfi1/chip.c | 4 ++--
drivers/infiniband/hw/hfi1/chip.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 26c5ee5..88394cd 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -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,
diff --git a/drivers/infiniband/hw/hfi1/chip.h b/drivers/infiniband/hw/hfi1/chip.h
index 92f2485..9234525 100644
--- a/drivers/infiniband/hw/hfi1/chip.h
+++ b/drivers/infiniband/hw/hfi1/chip.h
@@ -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
--
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next prev parent reply other threads:[~2016-09-25 14:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 14:40 [PATCH 00/13] IB/hfi1,qib: Round 2 of hfi1/qib fixes for 4.9 Dennis Dalessandro
[not found] ` <20160925143656.10261.85231.stgit-9QXIwq+3FY+1XWohqUldA0EOCMrvLtNR@public.gmane.org>
2016-09-25 14:40 ` [PATCH 01/13] IB/hfi1: Consolidate pio control masks into single definition Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 02/13] IB/qib: Remove qpt_mask global Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 03/13] IB/hfi1: Remove filtering of Set(PkeyTable) in HFI SMA Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 04/13] IB/hfi1: Increase default settings of max_cqes and max_qps Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 05/13] IB/hfi1: Extend i2c timeout Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 06/13] IB/hfi1: Do not read more than a SGE length Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 07/13] IB/hfi1: Combine shift copy and byte copy for SGE reads Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 08/13] IB/hfi1: Fix defered ack race with qp destroy Dennis Dalessandro
2016-09-25 14:41 ` [PATCH 09/13] IB/hfi1: Act on external device timeout Dennis Dalessandro
2016-09-25 14:42 ` Dennis Dalessandro [this message]
2016-09-25 14:42 ` [PATCH 11/13] IB/hfi1: Cleanup tasklet refs in comments Dennis Dalessandro
2016-09-25 14:42 ` [PATCH 12/13] IB/hfi1: Remove unused variable from devdata Dennis Dalessandro
2016-09-25 14:42 ` [PATCH 13/13] IB/hfi1: Fix resource release in context allocation Dennis Dalessandro
2016-10-02 13:29 ` [PATCH 00/13] IB/hfi1,qib: Round 2 of hfi1/qib fixes for 4.9 Doug Ledford
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