Date   : Fri, 31 Jul 2009 19:46:12 +0100
From   : robert@... (Rob)
Subject: Units of memory, Was: Master Ethernet upgrade

On 31/07/2009, Alex Taylor <zeem.uk@...> wrote:
>
> I'm pretty sure that's not true. There's a small performance hit on
> HT-capable P4 processors in certain applications, due to the way the
> P4 works, but it's not because HT divides the CPU into two units of
> half the speed each.


Hmm... all I can say is that with HT on, I could see certain apps
taking 100% of one of the two "cpus" in task manager, 50% usage
overall, but with HT off, and only one "cpu" now showing in task
manager, it would take up nearer 75-80% ..  It's a couple of years
since I played with it, and some time since that machine was last
switched on, so I can't quite remember /which/ app it was I was trying
to speed up..