From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:38688) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UTCKp-00016s-Mr for qemu-devel@nongnu.org; Fri, 19 Apr 2013 10:30:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UTCKo-0006At-Dv for qemu-devel@nongnu.org; Fri, 19 Apr 2013 10:30:43 -0400 Received: from mail-ee0-f53.google.com ([74.125.83.53]:56934) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UTCKo-0006Am-5Q for qemu-devel@nongnu.org; Fri, 19 Apr 2013 10:30:42 -0400 Received: by mail-ee0-f53.google.com with SMTP id d17so1163183eek.40 for ; Fri, 19 Apr 2013 07:30:41 -0700 (PDT) Sender: Paolo Bonzini From: Paolo Bonzini Date: Fri, 19 Apr 2013 16:30:30 +0200 Message-Id: <1366381830-11267-4-git-send-email-pbonzini@redhat.com> In-Reply-To: <1366381830-11267-1-git-send-email-pbonzini@redhat.com> References: <1366381830-11267-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 3/3] nbd: set TCP_NODELAY List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: stefanha@redhat.com From: Stefan Hajnoczi 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 Tested-by: Nick Thomas Signed-off-by: Stefan Hajnoczi Signed-off-by: Paolo Bonzini --- block/nbd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/nbd.c b/block/nbd.c index 485bbf0..d9dc454 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -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 */ -- 1.8.1.4