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authorStefan Hajnoczi <stefanha@redhat.com>2013-02-27 15:05:47 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-25 11:13:09 +0100
commit20048d0a12b1080f688ff9b82696134df1aa3607 (patch)
treec28b096d6126a8a1d6918d80f903338da4a4fa4d /net
parentfe6344a05fba26e16863fefcb823242e579b0991 (diff)
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net: use socket_set_nodelay() for -netdev socket
Reduce -netdev socket latency by disabling the Nagle algorithm on SOCK_STREAM sockets in net/socket.c. Since we are tunelling Ethernet over TCP we shouldn't artificially delay outgoing packets, let the guest decide packet scheduling. I already get sub-millisecond -netdev socket ping times on localhost, so there was no measurable difference in my testing. This won't hurt though and may improve remote socket performance. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/socket.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c
index d8b35a2..b0c83e0 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -438,6 +438,9 @@ static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
s->fd = fd;
s->listen_fd = -1;
+ /* Disable Nagle algorithm on TCP sockets to reduce latency */
+ socket_set_nodelay(fd);
+
if (is_connected) {
net_socket_connect(s);
} else {