[dpdk-stable] patch 'net/ice: enlarge Rx queue rearm threshold to 64' has been queued to stable release 19.11.7

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 19.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/06/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/cpaelzer/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/cpaelzer/dpdk-stable-queue/commit/f5d4f7382f9143f92ae32cdd93571fa8d9ea57fd

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From f5d4f7382f9143f92ae32cdd93571fa8d9ea57fd Mon Sep 17 00:00:00 2001
From: Leyi Rong <leyi.rong at intel.com>
Date: Wed, 6 Jan 2021 13:35:48 +0800
Subject: [PATCH] net/ice: enlarge Rx queue rearm threshold to 64

[ upstream commit 295906ffaad9bd8e730248fb24be8fb437df1769 ]

We observe performance drop on ice AVX512 data path after stop and
start by using testpmd.

As CPU polling is faster in AVX512 path, L3 contested accesses is
intensified when rxrearm_start is a random value after testpmd
stop/start.

Enlarge ICE_RXQ_REARM_THRESH to 64 to ease the contested accesses and
fix the performance drop issue.

Signed-off-by: Leyi Rong <leyi.rong at intel.com>
Acked-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/ice/ice_rxtx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ice/ice_rxtx.h b/drivers/net/ice/ice_rxtx.h
index 041f00970d..f80fdc1d6b 100644
--- a/drivers/net/ice/ice_rxtx.h
+++ b/drivers/net/ice/ice_rxtx.h
@@ -31,7 +31,7 @@
 
 #define ICE_VPMD_RX_BURST           32
 #define ICE_VPMD_TX_BURST           32
-#define ICE_RXQ_REARM_THRESH        32
+#define ICE_RXQ_REARM_THRESH        64
 #define ICE_MAX_RX_BURST            ICE_RXQ_REARM_THRESH
 #define ICE_TX_MAX_FREE_BUF_SZ      64
 #define ICE_DESCS_PER_LOOP          4
-- 
2.30.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-04 12:04:29.794411436 +0100
+++ 0040-net-ice-enlarge-Rx-queue-rearm-threshold-to-64.patch	2021-02-04 12:04:27.950789652 +0100
@@ -1 +1 @@
-From 295906ffaad9bd8e730248fb24be8fb437df1769 Mon Sep 17 00:00:00 2001
+From f5d4f7382f9143f92ae32cdd93571fa8d9ea57fd Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 295906ffaad9bd8e730248fb24be8fb437df1769 ]
+
@@ -16,2 +17,0 @@
-Cc: stable at dpdk.org
-
@@ -25 +25 @@
-index 6b16716063..adfae016a9 100644
+index 041f00970d..f80fdc1d6b 100644