Please help me understand pciutils output

Chuck Swiger cswiger at
Mon Jun 7 10:25:43 PDT 2004

Luke wrote:
[ ... ]
>> More details about the USB performance in terms of numbers you are 
>> seeing from some benchmark would be very useful.
> I agree.  How can I benchmark my just my USB controller?

Using a mass storage device like an external hard drive is probably the best 
bet.  In the message you replied to, I made some suggestions with regard to 
using iozone, or dd, etc.

> Right now all I can say is that I've got a Netgear FA120 network 
> interface plugged into a USB port and I can't squeeze more than 4Mb/s 
> out of it. It's USB 2.0 compliant and should get close to 100Mb/s.  I 
> get faster results out of my old 10Mb ISA card.

That almost sounds like the NIC is running at USB 1.1 speeds, yes.  Note that 
you won't generally see more than about 90% utilization for network devices 
due to protocol overhead and latency, but you ought to be getting something 
closer to 50-80 Mbs...

[ ...comments about NEC chip snipped... ]


More information about the freebsd-questions mailing list