Performance Problem w/fragmented packets on load-balanced link

[Bene, Martin]

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Hi, 

I'm running into performance problems with big (=fragmented) packets;
both endpoints are running kernel 2.2.18+Andreas VM patch. The
systems involved are each connected to the internet using 128kBit
leased lines. Network throughput drops from about 12/13kBytes/sec
using smaller packets to something like 5kByte if fragmentation is
needed.

There's one unusual aspect to the connection: on one side, the
128kbit link is actually two seperate 64kbit links with load
balancing over them. Load balancing is done using cisco routers. This
in turn gives funnies with packets/fragments arriving NOT in the
order they were sent.

                      /--- line 1 ---\
Inet---Cisco-provider                 cisco cust.--- linux box
                      \--- line 2 ---/

Has anyone seen such effects under similar conditions? any idea if
something can be done?

Thanks, Martin Bene
PS: Sorry for the previous empty message - tripped over the send
button.

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