4.19-stable patches

added patches:
	mac80211-change-default-tx_sk_pacing_shift-to-7.patch

diff --git a/queue-4.19/mac80211-change-default-tx_sk_pacing_shift-to-7.patch b/queue-4.19/mac80211-change-default-tx_sk_pacing_shift-to-7.patch
new file mode 100644 (file)
index 0000000..b539fd0
--- /dev/null
+++ b/queue-4.19/mac80211-change-default-tx_sk_pacing_shift-to-7.patch
@@ -0,0 +1,48 @@
+From 5c14a4d05f68415af9e41a4e667d1748d41d1baf Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
+Date: Thu, 21 Feb 2019 18:29:36 +0100
+Subject: mac80211: Change default tx_sk_pacing_shift to 7
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Toke Høiland-Jørgensen <toke@redhat.com>
+
+commit 5c14a4d05f68415af9e41a4e667d1748d41d1baf upstream.
+
+When we did the original tests for the optimal value of sk_pacing_shift, we
+came up with 6 ms of buffering as the default. Sadly, 6 is not a power of
+two, so when picking the shift value I erred on the size of less buffering
+and picked 4 ms instead of 8. This was probably wrong; those 2 ms of extra
+buffering makes a larger difference than I thought.
+
+So, change the default pacing shift to 7, which corresponds to 8 ms of
+buffering. The point of diminishing returns really kicks in after 8 ms, and
+so having this as a default should cut down on the need for extensive
+per-device testing and overrides needed in the drivers.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+
+---
+ net/mac80211/tx.c |    4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -3614,10 +3614,10 @@ void __ieee80211_subif_start_xmit(struct
+               /* We need a bit of data queued to build aggregates properly, so
+                * instruct the TCP stack to allow more than a single ms of data
+                * to be queued in the stack. The value is a bit-shift of 1
+-               * second, so 8 is ~4ms of queued data. Only affects local TCP
++               * second, so 7 is ~8ms of queued data. Only affects local TCP
+                * sockets.
+                */
+-              sk_pacing_shift_update(skb->sk, 8);
++              sk_pacing_shift_update(skb->sk, 7);
+ 
+               fast_tx = rcu_dereference(sta->fast_tx);
+ 

diff --git a/queue-4.19/series b/queue-4.19/series
index a37d2a56e16f7e501f205e7163f7e75b91349bdb..2cf9d059e2effa3bb8fc365bdde755618c3c06a1 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -1,3 +1,4 @@
 irq-matrix-split-out-the-cpu-selection-code-into-a-h.patch
 irq-matrix-spread-managed-interrupts-on-allocation.patch
 genirq-matrix-improve-target-cpu-selection-for-manag.patch
+mac80211-change-default-tx_sk_pacing_shift-to-7.patch