Jim mack 2014-04-04 17:55:07
I posted a followup to this but it never appeared here… hope this one
I have implemented the router, thanks for the registry tip. It works,
but performance su… er, stinks.
Any tips on how to speed up the routing? I have to contend with very
different MTUs — 1500 on the GigE side and the driver max of 16242 on
the fiber side. We’d prefer to match the rest of the fiber network at
65260, but the 2K driver doesn’t support it.
The performance is bursty — very fast for a second, then a noticable
pause, presumably while the MTUs are accommodated by buffering.
Overall, though, the data rate is about the same as 100Base-T on the
same network. We’re not concerned about burst rate, since transfers
will typically be 400MB to several GB in size, just overall end-to-end
This is an NFS connection: two NAS devices on the GigE side are mounted
as drives on various Irix machines through the bridging PC. I haven’t
scoped the traffic, but I presume that NFS is using something other than
TCP for its transport.
Is there dedicated routing software available that might help? Would
running 2K Server make a difference? The PC is more than capable (dual
866MHz, 256MB RAM), and loafs throughout the transfers. The cards are
both in PCI 64/66 slots, and use different interrupts.