Re: [9fans] Re: what about microkernel?

[erik quanstrom <quanstro@coraid.com>]

> I've been thinking a lot about this, particularly as we've been diving
> deep into tracing performance of our network paths as part of the Blue
> Gene work.  As of our preliminary results, it would seem that Plan 9
> attempts to take the most general approach to things with an emphasis
> on keeping everything simple.  Unfortunately we end up paying a heavy
> price in raw performance (at least in the networking case).

i have found plan 9 ip networking does not fair well pushing ip networking
at 10gbps, especially tcp, and especially with standard ethernet frames.

i didn't spend enough time this spring with the tcp stack to understand what
it's doing, but i got the impression that it could make the simple case
of receiving packets in order simplier at the expence of misorderd packets.

fwiw, we get much greater performance pushing AoE.  so i don't think
that network queues themselves are the problem.

- erik