diff options
| author | Menglong Dong <imagedong@tencent.com> | 2021-11-28 14:01:02 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-11-29 13:05:47 +0000 |
| commit | aeeecb889165617a841e939117f9a8095d0e7d80 (patch) | |
| tree | d5f96508b40bed44e1256c6097420adbccd9128e /net/ipv4/tcp_output.c | |
| parent | e9538f8270db24d272659e15841854c7ea11119e (diff) | |
| download | linux-aeeecb889165617a841e939117f9a8095d0e7d80.tar.gz | |
net: snmp: add statistics for tcp small queue check
Once tcp small queue check failed in tcp_small_queue_check(), the
throughput of tcp will be limited, and it's hard to distinguish
whether it is out of tcp congestion control.
Add statistics of LINUX_MIB_TCPSMALLQUEUEFAILURE for this scene.
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 5079832af5c10..c4ab6c8f0c77d 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2524,8 +2524,11 @@ 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) + if (refcount_read(&sk->sk_wmem_alloc) > limit) { + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPSMALLQUEUEFAILURE); return true; + } } return false; } |