em bad performance

[Danny Braniss]

> On Wed, Dec 21, 2005 at 06:55:29PM +0200, Danny Braniss wrote:
> D> 	this particular mb, intel sr1435vp2, has 2 ethernets,
> D> one is an Intel '82547EI Gigabit Ethernet Controller', the other is
> D> a Marvell (which seems that the driver is around the corner).
> D> 
> D> the em performance under 6.0-stable is half of any other box i have,
> D> and a similar mb running linux gives about 1GB, so
> D> 
> D> 	Q: any ideas what can be wrong?
> 
> Please be more informative. How do you measure performance: netperf,
> ftp, ... ?

iperf

iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[  4] local 132.65.16.100 port 5001 connected with [6.0/SE7501WV2] port 58122 
(intel westvill)
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.01 GBytes   867 Mbits/sec
[  4] local 132.65.16.100 port 5001 connected with [5.4/SE7501WV2] port 55269 
(intel westvill)
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec   967 MBytes   811 Mbits/sec
[  5] local 132.65.16.100 port 5001 connected with [6.0/SR1435VP2 port 58363  
(intel dual xeon/emt64)
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec   578 MBytes   485 Mbits/sec

i've run this several times, and the results are very similar.
i also tried i386, and the same bad results.
all hosts are connected at 1gb to the same switch.

> 
> What is the box doing: routing, bridging, running ftp server?
nothing :-(
i noticed the badness when trying to set it up as my new dev. machine
and tried a make buildworld, and after 4hs i realized that something
is bad.

danny