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Date:   Mon,  4 Mar 2019 09:21:47 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,,
        Toke Høiland-Jørgensen <>,
        Johannes Berg <>
Subject: [PATCH 4.19 04/78] mac80211: Change default tx_sk_pacing_shift to 7

4.19-stable review patch.  If anyone has any objections, please let me know.


From: Toke Høiland-Jørgensen <>

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.

Signed-off-by: Toke Høiland-Jørgensen <>
Signed-off-by: Johannes Berg <>
Signed-off-by: Greg Kroah-Hartman <>

 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);

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