[Qemu-devel] [PATCH 0/3] nbd: use TCP_NODELAY

[Stefan Hajnoczi]

The nbd block driver should use TCP_NODELAY.  Nick Thomas <address@hidden>
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(-)

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1.8.1.4