Messages in this thread | | | Date | Fri, 24 Aug 2001 11:17:42 -0700 | From | Thomas Davis <> | Subject | Re: Poor Performance for ethernet bonding |
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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?
Most bonding problems are either the card driver is busted, the card is busted (el-cheapo NE2000 PCI clones are really bad..) or the switch can't handle it. Most cheap, dumb switches break big time when using Bonding with them.
-- ------------------------+-------------------------------------------------- Thomas Davis | ASG Cluster guy tadavis@lbl.gov | (510) 486-4524 | "80 nodes and chugging Captain!" - 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/
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