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| author |   Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-09-30 16:54:08 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-10-05 03:34:53 -0700 |
| commit | 1edd6a14d24f21b8b478970c63a243a08e2b55b0 (patch) | |
| tree | 69b0d3d0619f70911f9dee2b98bbc9072fc14b50 /COPYING | |
| parent | RDS: Use a single TCP socket for both send and receive. (diff) | |
| download | linux-dev-1edd6a14d24f21b8b478970c63a243a08e2b55b0.tar.xz linux-dev-1edd6a14d24f21b8b478970c63a243a08e2b55b0.zip | |
RDS-TCP: Do not bloat sndbuf/rcvbuf in rds_tcp_tune
Using the value of RDS_TCP_DEFAULT_BUFSIZE (128K)
clobbers efficient use of TSO because it inflates the size_goal
that is computed in tcp_sendmsg/tcp_sendpage and skews packet
latency, and the default values for these parameters actually
results in significantly better performance.
In request-response tests using rds-stress with a packet size of
100K with 16 threads (test parameters -q 100000 -a 256 -t16 -d16)
between a single pair of IP addresses achieves a throughput of
6-8 Gbps. Without this patch, throughput maxes at 2-3 Gbps under
equivalent conditions on these platforms.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions