diff options
| author | Eric Dumazet <edumazet@google.com> | 2021-11-30 19:32:46 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-12-01 19:06:09 -0800 |
| commit | ce8299b6f76f28326fedce2b4da90888bd97eab2 (patch) | |
| tree | ee9c848444134a92a77dfab024e3c7b6c14183e2 /net/ipv4/tcp_output.c | |
| parent | 0dc1df05988820a5f51621ca373988082e155e53 (diff) | |
Revert "net: snmp: add statistics for tcp small queue check"
This reverts commit aeeecb889165617a841e939117f9a8095d0e7d80.
The new SNMP variable (TCPSmallQueueFailure) can be incremented
for good reasons, even on a 100Gbit single TCP_STREAM flow.
If we really wanted to ease driver debugging [1], this would
require something more sophisticated.
[1] Usually, if a driver is delaying TX completions too much,
this can lead to stalls in TCP output. Various work arounds
have been used in the past, like skb_orphan() in ndo_start_xmit().
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Menglong Dong <imagedong@tencent.com>
Link: https://lore.kernel.org/r/20211201033246.2826224-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index c4ab6c8f0c77..5079832af5c1 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2524,11 +2524,8 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb, * test again the condition. */ smp_mb__after_atomic(); - if (refcount_read(&sk->sk_wmem_alloc) > limit) { - NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPSMALLQUEUEFAILURE); + if (refcount_read(&sk->sk_wmem_alloc) > limit) return true; - } } return false; } |