On Tue, Jul 28, 2015 at 02:27:57AM +0000, Richard Laing wrote:
> From: Richard Laing <richard.la...@alliedtelesis.co.nz>
>
> Enable flow-based ECMP.
>
> Currently if equal-cost multipath is enabled the kernel chooses between
> equal cost paths for each matching packet, essentially packets are
> round-robined between the routes. This means that packets from a single
> flow can traverse different routes. If one of the routes experiences
> congestion this can result in delayed or out of order packets arriving
> at the destination.
>
> This patch allows packets to be routed based on their
> flow - packets in the same flow will always use the same route. This
> prevents out of order packets. There are other issues with round-robin
> based ECMP routing related to variable path MTU handling and debugging.
> See RFC2991 for more details on the problems associated with packet
> based ECMP routing.
>
> This patch relies on the skb hash value to select between routes. The
> selection uses a hash-threshold algorithm (see RFC2992).
>
> Signed-off-by: Richard Laing <richard.la...@alliedtelesis.co.nz>
The patch looks corrupted (long lines split, tabs converted to (four?)
spaces etc.
Michal Kubecek
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