This is a note to let you know that I've just added the patch titled
net_sched: gen_estimator: fix broken estimators based on percpu stats
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net_sched-gen_estimator-fix-broken-estimators-based-on-percpu-stats.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Mar 6 19:02:12 PST 2018
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Thu, 22 Feb 2018 19:45:27 -0800
Subject: net_sched: gen_estimator: fix broken estimators based on percpu stats
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit a5f7add332b4ea6d4b9480971b3b0f5e66466ae9 ]
pfifo_fast got percpu stats lately, uncovering a bug I introduced last
year in linux-4.10.
I missed the fact that we have to clear our temporary storage
before calling __gnet_stats_copy_basic() in the case of percpu stats.
Without this fix, rate estimators (tc qd replace dev xxx root est 1sec
4sec pfifo_fast) are utterly broken.
Fixes: 1c0d32fde5bd ("net_sched: gen_estimator: complete rewrite of rate estimators")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/gen_estimator.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -66,6 +66,7 @@ struct net_rate_estimator {
static void est_fetch_counters(struct net_rate_estimator *e,
struct gnet_stats_basic_packed *b)
{
+ memset(b, 0, sizeof(*b));
if (e->stats_lock)
spin_lock(e->stats_lock);
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.14/doc-change-the-min-default-value-of-tcp_wmem-tcp_rmem.patch
queue-4.14/tcp-purge-write-queue-upon-rst.patch
queue-4.14/net_sched-gen_estimator-fix-broken-estimators-based-on-percpu-stats.patch
queue-4.14/tcp_bbr-better-deal-with-suboptimal-gso.patch