From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50745) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1URkBT-0005wD-Cg for qemu-devel@nongnu.org; Mon, 15 Apr 2013 10:15:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1URkBQ-0007vf-8k for qemu-devel@nongnu.org; Mon, 15 Apr 2013 10:15:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55082) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1URkBP-0007vX-RH for qemu-devel@nongnu.org; Mon, 15 Apr 2013 10:15:00 -0400 From: Stefan Hajnoczi Date: Mon, 15 Apr 2013 16:14:45 +0200 Message-Id: <1366035288-15840-1-git-send-email-stefanha@redhat.com> Subject: [Qemu-devel] [PATCH 0/3] nbd: use TCP_NODELAY List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Paolo Bonzini , Stefan Hajnoczi , Nick Thomas The nbd block driver should use TCP_NODELAY. Nick Thomas measured a 40 millisecond latency added by the Naggle algorithm. This series turns on TCP_NODELAY. This requires that we use TCP_CORK to efficiently send NBD requests that contain a payload after the header. Finally, fix a bug where we forget to unlock a mutex when sending fails. Stefan Hajnoczi (3): nbd: unlock mutex in nbd_co_send_request() error path nbd: use TCP_CORK in nbd_co_send_request() nbd: set TCP_NODELAY block/nbd.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) -- 1.8.1.4