Re: Differences between AMD and Intel CPUs [was: Re: Dragonfly andHyperthreading....]

[David Xu <davidxu@xxxxxxxxxxx>]

EM1897@xxxxxxx wrote:

> In a message dated 3/9/2005 6:22:30 PM Eastern Standard Time, David Xu <davidxu@xxxxxxxx> writes:
>
>  
>
> > EM1897@xxxxxxx wrote:
> >
> >    
> >
> > > If you paid that much for an SMP system running FreeBSD,
> > > then you're flying blind for certain. You've overpaid 
> > > because you don't know enough about hardware to know
> > > what you're doing. Your xeon systems "sound like jets"
> > > because you've bought something that sounds like a jet.
> > > A P4 system with a single blower (which is what we use)
> > > will likely outperform what you've bought for 1/5th the
> > > cost. (my current 5.3R benchmarks show that FreeBSD
> > > with 2 3.06Ghz xeons is actually slower than a single
> > > P4 processor system. They've done a helleva job!).
> > >      
>
> I benchmark by passing packets through the box until it
> starts dropping packets. So there is no "package" to fail.
> 5.3 runs at about 90% with 650Kpps with a single 3.06
> xeon, and starts dropping packets at 300Kpps with dual
> processors. It seems ridiculous, but its so much slower
> than 4.x that its not worth much of my time.
>
>  
You've hit the wall then, I don't think 5.3R has a SMP aware TCP/IP stack,
Robert Watson and other guys did lots of work in 6.0-CURRENT, that
should already be improved, but I don't know if it can match performance of
RELENG_4.

David Xu