Thomas Davis wrote:
>
> Ben Greear wrote:
> >
> > Couldn't the bonding code be made to distribute pkts to one interface or
> > another based on a hash of the sending IP port or something? Seems like that
> > would fix the reordering problem for IP packets.... It wouldn't help for
> > a single stream, but I'm guessing the real world problem involves many streams,
> > which on average should hash such that the load is balanced...
> >
>
> Cisco etherchannel does this, by XOR'ing the dest address with the
> source address, AND'ing with # of interfaces (limiting you to a power of
> 2), and then using the number to determine what channel to use.
>
> Now, you end up in a 4 way Etherchannel, all the traffic going down one
> channel, and the none going down the other three. Does that sound like
> a balanced solution?
If Cisco can't do a balanced hash, that doesn't mean the idea is bad,
it just means they implemented it poorly. I would think that
something as simple as: src_ip_port % num_devices would give a
fairly even spread. I'm sure you could get fancier and take other
fields (dst_ip_port) into account in your hash.
-- Ben Greear <greearb@candelatech.com> <Ben_Greear@excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:14 EST