Slow networkperformance in current?

[Julian Elischer]

Jack Vogel wrote:
> On 7/20/07, Ståle Kristoffersen <staale at kristoffersen.ws> wrote:
>> On 2007-07-20 at 12:03, Jack Vogel wrote:
>> > The stack being capable, as I said, of delivering the goods says 
>> nothing
>> > of the driver, what NIC is it? Did you ask if anyone else with that
>> > hardware is seeing a problem, I came into this thread somewhat late.
>>
>> I'm running this nic:
>> re0: <RealTek 8168/8111B PCIe Gigabit Ethernet> port 0x7e00-0x7eff mem
>> 0xfd3ff000-0xfd3fffff irq 18 at device 0.0 on pci3
>>
>> But I'm guessing it's not the NIC or its drivers fault, because I get the
>> same performance (with 100% CPU) using localhost.
> 
> Well,  I just tried that on one of the machines here in my cube, running
> iperf across a localhost connection I get 1.25 Gb/s, what do you see?
> A second slightly older box doing the same thing only gets 977 Mb, I
> wonder if that's front side bus relative, would make sense.
> 
> And what do you see?

Loopback can sometimes be a lot slower than actual traffic due to scheduling
considerations.
Robert Watson has more information on this.

> 
> Jack
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