[lkml]   [2002]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Hyperthreading
On Wed, 21 Aug 2002, Reed, Timothy A wrote:

> Anyone,
> Can anyone lead me to a good source of information on what options should be
> in the kernel for hyperthreading?? I am still fighting with a
> sub-contractor over kernel options.

As long as you have a P4 and use the P4 support you will get
hyperthreading with 2.4.19 (CONFIG_MPENTIUM4=y). 2.4.18 you have to also
turn it on with a lilo option of acpismp=force on the kernel command line.

You might want to balance IRQs across the cpus. Ingo Molnar has created
patches for this, which I've put on my website

hyperthreading will give you some performance boostes, but *only*
if you have many runable processes a majority of the time, or very heavily
threaded applications running on the system. (an example would
be running 4 setiathome clients on a dual processor system).

James Bourne

> Tim

James Bourne, Supervisor Data Centre Operations
Mount Royal College, Calgary, AB, CA

This communication is intended for the use of the recipient to which it is
addressed, and may contain confidential, personal, and or privileged
information. Please contact the sender immediately if you are not the
intended recipient of this communication, and do not copy, distribute, or
take action relying on it. Any communication received in error, or
subsequent reply, should be deleted or destroyed.

"There are only 10 types of people in this world: those who
understand binary and those who don't."

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:28    [W:0.098 / U:0.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site