On 06/24/14 at 06:46pm, Jesse Gross wrote: > Currently, if the network stack provides skb->rxhash then we use it, > otherwise we compute our own. However, on at least some versions of > RHEL/CentOS, the stack provides a hash but it is 16 bits rather than > 32 bits. In cases where we use the upper most bits of the hash this > is particularly bad because we detect that a hash is present and we > use it rather than computing our own but the result is always zero. > > This is particularly noticible with tunnel ports that use the hash > to generate a source port, such as VXLAN. On these kernels the source > port is always zero when using VXLAN. To solve this problem while > still taking advantage of the procomputed hash, this rehashes the > hash so that the entropy is spread throughout 32 bits. > > Signed-off-by: Jesse Gross <je...@nicira.com>
Acked-by: Thomas Graf <tg...@noironetworks.com> _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
