i mentioned that a few month ago, if you configure the network, client and server right and you have the right HW in place you can get to ~ 50 Mbyte/sec from Client to Server over Gigabit. and btw. i saw that delay bug too and i can confirm that it has something to do with the HW you use, if that helps i only saw it on fast SMP boxes ..
Sven
| Ken Hornstein <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 11/03/06 08:06 PM |
|
> 350ms is the minimum retransmit delay. Is it possible that your network is
> dropping packets?
>
>It's possible, and I'll check. But a 10MB file takes 2 seconds to transfer
>using ssh over tcp, and over 4 minutes using afs over rx over udp. Is rx
>really that much worse than tcp?
I saw a paper that Sine Nomine did for a customer on AFS client
performance (the work is in the public domain, but it's actually rather
hard to find a copy of this paper). One thing they discovered is that
when network performance went above 100 megabits, Rx throughput fell off
erratically (on Gig-E, they observed an average throughput of 15 Mb/s).
So yes ... rx really is that much worse than TCP. I suspect that this
is a long-standing bug that has only manifested itself recently with the
advent of faster disks and network.
--Ken
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