em blues

[Jack Vogel]

On 10/11/06, Danny Braniss <danny at cs.huji.ac.il> wrote:
> the box is a bit old (Intel Pentium III (933.07-MHz 686-class CPU)
> dual cpu.
>
> running iperf -c (receiving):
>
> freebsd-4.10    0.0-10.0 sec    936 MBytes    785 Mbits/sec
> freebsd-5.4     0.0-10.0 sec    413 MBytes    346 Mbits/sec
> freebsd.6.1     0.0-10.0 sec    366 MBytes    307 Mbits/sec
> freebsd-6.2     0.0-10.0 sec    344 MBytes    289 Mbits/sec
>
> btw, iperf -s (xmitting) is slightly better
> freebsd-4.10    0.0-10.0 sec    664 MBytes    558 Mbits/sec
> freebsd-5.4     0.0-10.0 sec    390 MBytes    327 Mbits/sec
> freebsd-6.1     0.0-10.0 sec    495 MBytes    415 Mbits/sec
> freebsd-6.2     0.0-10.0 sec    487 MBytes    408 Mbits/sec
>
> so, it seems that as the release number increases, the em
> throughput gets worse - or iperf is.

You arent measuring em, you're measuring RELEASES on
your hardware, is this a surprise on a P3, no.

I still do 930ish Mb/s on a P4 with a PCI-E or PCI-X adaptors
running 6.1, in fact can do that with a 4 port adaptor I believe.


Regards,

Jack