Cap on network speed in CURRENT?

Luke luked at
Tue Jun 1 19:46:18 PDT 2004

>> This is indeed a very slow host, by modern standards.  It's a fussy old
>> Pentium 166MHz that I've put through hell for the last eight years or
>> so.
>> I'm building a kernel with witness and invariants turned off.  Building
>> a kernel usually takes overnight.  I'll try it out tomorrow and see how
>> it goes.  If those testing programs don't require X, I'll see about
>> installing one of them to help me figure out what's going on.  The iperf
>> site looks like it's got some helpful information that I should read
>> too.
> Also, try disabling SMP and possibly APIC support if it's a UP box.
> There's a measurable performance overhead to compiling with SMP support,
> since mutexes have to be compiled with locked instructions.

This is a dual processor box, but I gave up and took SMP and APIC out of 
the kernel back in mid-April because the system would always panic on 
startup if I had both multiprocessor support and a RAID array defined at 
the same time. 
I made a thread about it on freebsd-questions but got no responses, so in 
complete bafflement I just turned off the multiprocessor support and 
rebuilt everything.  The RAID was more important to me.
I wouldn't be a bit surprised if that's a hardware problem.  This old 
motherboard has a lot of quirks and I think it's probably going to die the 
next time I open the case.

Thanks for the tip though.  I wouldn't have thought of that.

More information about the freebsd-current mailing list