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author | Soheil Hassas Yeganeh <soheil@google.com> | 2020-09-14 23:52:09 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-09-15 01:58:24 +0200 |
commit | 8ba3c9d1c6d75d1e6af2087278b30e17f68e1fff (patch) | |
tree | df6b4e7b5a19abda719a7ad98e369630f70af454 | |
parent | ionic: fix up debugfs after queue swap (diff) | |
download | linux-8ba3c9d1c6d75d1e6af2087278b30e17f68e1fff.tar.xz linux-8ba3c9d1c6d75d1e6af2087278b30e17f68e1fff.zip |
tcp: return EPOLLOUT from tcp_poll only when notsent_bytes is half the limit
If there was any event available on the TCP socket, tcp_poll()
will be called to retrieve all the events. In tcp_poll(), we call
sk_stream_is_writeable() which returns true as long as we are at least
one byte below notsent_lowat. This will result in quite a few
spurious EPLLOUT and frequent tiny sendmsg() calls as a result.
Similar to sk_stream_write_space(), use __sk_stream_is_writeable
with a wake value of 1, so that we set EPOLLOUT only if half the
space is available for write.
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | net/ipv4/tcp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index d3781b6087cb..48c351804efc 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -564,7 +564,7 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait) mask |= EPOLLIN | EPOLLRDNORM; if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { - if (sk_stream_is_writeable(sk)) { + if (__sk_stream_is_writeable(sk, 1)) { mask |= EPOLLOUT | EPOLLWRNORM; } else { /* send SIGIO later */ sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); @@ -576,7 +576,7 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait) * pairs with the input side. */ smp_mb__after_atomic(); - if (sk_stream_is_writeable(sk)) + if (__sk_stream_is_writeable(sk, 1)) mask |= EPOLLOUT | EPOLLWRNORM; } } else |