I would turn off ethernet flow control. Maybe you already have.
It can be really mean on tcp's own flow control if the switch has an
issue of some kind (load).
/Tias
15 feb 2009 kl. 10.24 skrev Chris <ch...@ghostbusters.co.uk>:
Thanks, Karl, Allen and Nickola.
I failed-over to another router last night and briefly had full
expected
throughput but this morning despite dropping providers and moving
between
routers again for trial and error I still see _outbound_ TCP at
about the
same 300 - 600kbps per session.
I eliminated conntract modules firstly, then iptables as a whole. I've
eliminated TSO and checksumming (which caused very sticky
connections) on
the e1000 NIC.
The failover router has a slightly older kernel and was working before
Christmas so it's not most likely not kernel versions. I've also tried
removing FIB_TRIE as a stab in the dark with no success. And the
failover
router connects using FE not GE so I've eliminated NICs and connection
speeds to a front-facing switch.
The only constant is the front-facing switch (it's negotiating
perfectly at
FD though) so all I can think of is removing that from the equation.
It's definitely only _outbound_ TCP getting buffered though ! I've
pushed
92Mbps on a FE link with UDP and uploaded at 16Mbps on a 16Mbps link.
Any last ideas appreciated before causing headaches removing
switches would
be appreciated.
Thanks,
Chris
