<snip>
>
> Since he's using the memory cache and a pretty sizeable loop count,
> it's probably not disk I/O. I'm guessing most of it is overhead of
> doing 500K write()'s per second.
>
> When you're getting 995Mbps, I doubt your average packet size is 102
> bytes like Jeff's. If it is, then I'd love to hear more about your
> setup (kernel version, tuning, hardware, etc)
>
You are correct, thats with 9K jumbo frames (these are HPC people, they
don't do no stinkin small frames :-)). At 1500 it drops to about 650 megs.
The default untuned kernel 35 megabits was also 9k jumbo frames. Some time
I'll poke at why the drop at a 1500 MTU (perhaps something in tcp, perhaps
interrupt load perhaps something else). The bottom line is going fast
is hard with lots and lots of non obvious places that can bite you :-).
Peter Van Epp / Operations and Technical Support
Simon Fraser University, Burnaby, B.C. Canada
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Tcpreplay-users mailing list
Tcpreplay-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/tcpreplay-users
Support Information: http://tcpreplay.synfin.net/trac/wiki/Support
