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| author | Lucas Nussbaum <lucas.nussbaum@ens-lyon.fr> | 2009-02-13 08:33:41 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-02-16 00:03:09 -0800 |
| commit | 06e868066e3b5828383eb40ff4d1c0029100b0b5 (patch) | |
| tree | 5fb84de9aff8a0b5d225a4c1137000ef6cc00dd5 /net/sctp/output.c | |
| parent | 85e8d004ecbc51ead6ae926e15973b42cf07b36e (diff) | |
| download | op-kernel-dev-06e868066e3b5828383eb40ff4d1c0029100b0b5.zip op-kernel-dev-06e868066e3b5828383eb40ff4d1c0029100b0b5.tar.gz | |
sctp: Allow to disable SCTP checksums via module parameter
This is a new version of my patch, now using a module parameter instead
of a sysctl, so that the option is harder to find. Please note that,
once the module is loaded, it is still possible to change the value of
the parameter in /sys/module/sctp/parameters/, which is useful if you
want to do performance comparisons without rebooting.
Computation of SCTP checksums significantly affects the performance of
SCTP. For example, using two dual-Opteron 246 connected using a Gbe
network, it was not possible to achieve more than ~730 Mbps, compared to
941 Mbps after disabling SCTP checksums.
Unfortunately, SCTP checksum offloading in NICs is not commonly
available (yet).
By default, checksums are still enabled, of course.
Signed-off-by: Lucas Nussbaum <lucas.nussbaum@ens-lyon.fr>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/output.c')
| -rw-r--r-- | net/sctp/output.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c index 47bfba6c..2d65b7a 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -531,7 +531,7 @@ int sctp_packet_transmit(struct sctp_packet *packet) * Note: Adler-32 is no longer applicable, as has been replaced * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>. */ - if (!(dst->dev->features & NETIF_F_NO_CSUM)) { + if (!sctp_checksum_disable && !(dst->dev->features & NETIF_F_NO_CSUM)) { crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len); crc32 = sctp_end_cksum(crc32); } else |
