RE: [gentoo-user] Symlinking /usr/portage/distfiles

["Nelson, David \(ED, PAR&D\)" <David.Nelson2@astrazeneca.com>]

> -----Original Message-----
> From: Mark Kirkwood [mailto:markir@paradise.net.nz]
> Sent: 31 January 2007 23:49
> To: gentoo-user@lists.gentoo.org
> Subject: Re: [gentoo-user] Symlinking /usr/portage/distfiles
> 
> 
> Boyd Stephen Smith Jr. wrote:
> > On Wednesday 31 January 2007 09:58, Alan McKinnon 
> > <alan@linuxholdings.co.za> wrote about 'Re: [gentoo-user] 
> > Symlinking /usr/portage/distfiles':
> >> On Wednesday 31 January 2007, Bo Ørsted Andresen wrote:
> >>> Furthermore Pentium 4 is a joke (it performs horribly). A 2 GHz
> >>> (Dothan I presume) Pentium-M should be faster than a 2,8 
> GHz Pentium
> >>> 4. My timing is for an 1,6 GHz (Banias) Pentium-M btw.
> >> This sounds odd, but I'm not a cpu expert so can't really 
> comment. Care
> >> to elaborate on why the P4 performs so horribly?
> > 
> > The instruction pipeline is very long, the CPU <-> RAM 
> bandwith is quite 
> > small, and the pipeline has to be emptied any time the 
> branch predictor is 
> > wrong.  While the pipeline fills, the CPU works but no results are 
> > visible.
> > 
> > Hz has never been a complete trump of other issues affecting CPU 
> > performance, but is always a factor to consider.  (Among 
> CPUs that are 
> > otherwise identical, higher Hz wins.)
> > 
> 
> Also Pentium-M has a lower latency L2 cache than P-4. With respect to 
> pipeline lengths I was curious to see what they actually 
> were: P-4 has 
> 20 stages, P-M has.. err... < 20 stages (Intel won't say exactly!).
> 
> I found this an interesting read for those of you interested in this:
> 
> http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2342&p=1
> 
> Cheers
> 
> Mark


At the risk of pulling this topic a little more off-topic - the P-M vs P-4 is an interesting case of a Pentium 3 chipset with a die shrink outperforming a P-4.

The Intel Core (2) Solo/Duo CPUs are based on the Pentium M as well. Netburst is pretty much dead afaik.

--
djn

Disclaimer: I represent no-one else in my emails to this list. Use any advice given at your own risk.

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