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DragonFly users List (threaded) for 2005-03
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Re: Differences between AMD and Intel CPUs [was: Re: Dragonfly andHyperthreading....]

From: David Xu <davidxu@xxxxxxxxxxx>
Date: Thu, 10 Mar 2005 10:28:42 +0800

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

David Xu

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