lkml.org 
[lkml]   [2006]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
On Wed, 29 Nov 2006 23:26:05 -0500
Ben Collins <bcollins@ubuntu.com> wrote:

> This patch adds a config option to allow disabling hyper-threading by
> default, and a kernel command line option to changes this default at
> boot time.
>
> Signed-off-by: Ben Collins <bcollins@ubuntu.com>

The description is wrong - this does not disable hyperthreading it merely
leaves one thread idle. I don't believe Intel have ever published a
procedure for truely disabling HT, but if you idle a thread you may want
to adjust the cache settings on a PIV (10.5.6 in the intel docs) and set
it to shared mode. Need to play more with what the bios does I guess.

So Ack but with the proviso it should say "Ignoring" or "Not using" not
"Disabling", because it does not do the latter and there seem to be
performance differences as a result

Acked-by: Alan Cox <alan@redhat.com>

Alan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-11-30 12:03    [W:0.130 / U:0.556 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site