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| author | Florian Westphal <fw@strlen.de> | 2017-07-30 03:57:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-31 14:37:49 -0700 |
| commit | e7942d0633c47c791ece6afa038be9cf977226de (patch) | |
| tree | 27dddb46a5358137f6cb6e63bddab14a77a840ec /net/ipv4/tcp_minisocks.c | |
| parent | 764646b08d09d29adced740c26447ecdaabc9088 (diff) | |
| download | linux-e7942d0633c47c791ece6afa038be9cf977226de.tar.gz linux-e7942d0633c47c791ece6afa038be9cf977226de.tar.bz2 linux-e7942d0633c47c791ece6afa038be9cf977226de.zip | |
tcp: remove prequeue support
prequeue is a tcp receive optimization that moves part of rx processing
from bh to process context.
This only works if the socket being processed belongs to a process that
is blocked in recv on that socket.
In practice, this doesn't happen anymore that often because nowadays
servers tend to use an event driven (epoll) model.
Even normal client applications (web browsers) commonly use many tcp
connections in parallel.
This has measureable impact only in netperf (which uses plain recv and
thus allows prequeue use) from host to locally running vm (~4%), however,
there were no changes when using netperf between two physical hosts with
ixgbe interfaces.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_minisocks.c')
| -rw-r--r-- | net/ipv4/tcp_minisocks.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 0ff83c1637d8..188a6f31356d 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -445,7 +445,6 @@ struct sock *tcp_create_openreq_child(const struct sock *sk, newtp->snd_sml = newtp->snd_una = newtp->snd_nxt = newtp->snd_up = treq->snt_isn + 1; - tcp_prequeue_init(newtp); INIT_LIST_HEAD(&newtp->tsq_node); tcp_init_wl(newtp, treq->rcv_isn); |