Re: Poor Performance for ethernet bonding

From: Andi Kleen (ak@suse.de)
Date: Fri Aug 24 2001 - 08:44:29 EST


Bernhard Busch <bbusch@biochem.mpg.de> writes:

> Hi
>
>
> I have tried to use ethernet network interfaces bonding to increase
> peformance.
>
> Bonding is working fine, but the performance is rather poor.
> FTP between 2 machines ( kernel 2.4.4 and 4 port DLink 100Mbit ethernet
> card)
> results in a transfer rate of 3MB/s).
>
> Any Hints?

Bonding reorders packets, which causes frequent retransmits and stalls in TCP.
One setup that doesn't is multipath routing (ip route .. with multiple
nexthops over different interfaces). It'll only load balance (srcip, dstip,tos)
tuples though, not individual flows, but then it has the advantage that
it actually works.

-Andi
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