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nbd: set TCP_NODELAY

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Disable the Nagle algorithm to reduce latency.  Note this means we must
also use TCP_CORK when sending header followed by payload to avoid
fragmenting lots of little packets.  The previous patch took care of
that.

Suggested-by: Nick Thomas <nick@bytemark.co.uk>
Tested-by: Nick Thomas <nick@bytemark.co.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-04-15 16:14:48 +02:00 committed by Paolo Bonzini
parent 0fcece25c0
commit 97ebbab0e3
1 changed files with 3 additions and 0 deletions
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3
block/nbd.c
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@ -406,6 +406,9 @@ static int nbd_establish_connection(BlockDriverState *bs)
sock = unix_socket_outgoing(qemu_opt_get(s->socket_opts, "path"));
} else {
sock = tcp_socket_outgoing_opts(s->socket_opts);
if (sock >= 0) {
socket_set_nodelay(sock);
}
}
/* Failed to establish connection */