Subject: Re: Dell PowerEdge 8450
To: None <>
From: Toru Nishimura <>
List: tech-smp
Date: 03/01/2004 12:53:34
Simon Burge said;

>>> SMP Linux kernel runs well too showing 4
>>> processors (2 processor x 2 thread) inside.  A lengthy booting dmesg follows;
>> If you make an ACPI kernel, you'll see 4 processors under netbsd too.
> For some "./ -j<N>" tests, I didn't see much difference between
> 2 "real" CPUs and 4 HT CPUs on a dual Xeon box.  I've left that box with
> 2 "real" CPUs for now.

At the technical conference track held at Interop 03 Tokyo,  a researcher
from one of the major Japanese university presented extensive hands-on
reports about the various aspect of server scalability.  His lab tested HT
servers and concluded _the_ HT SMP Linux kernel implementation
scales actually worse, at least no better, than plain SMP kernel.  It
sounded HT is rather waste of transistor and electricity.

Toru Nishimura/ALKYL Technology