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authorLucas Nussbaum <lucas.nussbaum@ens-lyon.fr>2009-02-13 08:33:41 +0000
committerDavid S. Miller <davem@davemloft.net>2009-02-16 00:03:09 -0800
commit06e868066e3b5828383eb40ff4d1c0029100b0b5 (patch)
tree5fb84de9aff8a0b5d225a4c1137000ef6cc00dd5 /net/sctp/output.c
parent85e8d004ecbc51ead6ae926e15973b42cf07b36e (diff)
downloadop-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.c2
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* Note: Adler-32 is no longer applicable, as has been replaced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
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