Fedora Linux Support Community & Resources Center
  #1  
Old 26th March 2004, 04:07 PM
GrigLars Offline
Registered User
 
Join Date: Mar 2004
Location: Fairfax, VA
Posts: 8
Single P4 3.0ghz showing up as dual proc

I have an odd issue, but it doesn't seem to be hindering my Linux box.

I just built a new box last night, usuing an Intel 865PERL single processor board, and a 3.0 ghz P4 cpu with 1GB DDR400 RAM. The board and chip have 800mhz fsb and support "hyperthreading" (whatever that is).

Well, before I set it up, I put in Knoppix (Debian-based LiveCD) CD to test the hardware, and noticed it booted as a dual-proc (smp). Huh. I didn't pay too much attention to this until I installed Fedora Core 1, and noticed it default booted to an smp kernel. It runs great on smp so far, but there's only a single processor in the box.

Any clues as to what Linux is seeing? Will leaving it as smp screw up anything down the road?
Reply With Quote
  #2  
Old 26th March 2004, 04:15 PM
SuperNu Offline
Registered User
 
Join Date: Mar 2004
Posts: 617
Linux sees all P4 processors with hyperthreading as dual processors. It is fine. Hyperthreading is a way to speed up execution. The processor appears to be a dual processor, but in fact is a single processor. Some reviews have seen a 20%-30% performance increase due to hyperthreading. Here is a link from Intel which explains what hyperthreading is.

--SN
Reply With Quote
  #3  
Old 26th March 2004, 04:50 PM
Jman Offline
Registered User
 
Join Date: Mar 2004
Location: Minnesota, USA
Age: 28
Posts: 7,909
I'm quite skeptical of claims you can get a huge performance boost out of a CPU by letting software pretend it is two. I haven't tried it yet, but I don't think I would notice the difference.

Interesting to note that the Linux kernel was just as quick to support hyperthreading as Windows.
Reply With Quote
  #4  
Old 26th March 2004, 06:06 PM
SuperNu Offline
Registered User
 
Join Date: Mar 2004
Posts: 617
Hyperthreading isn't pretending to be 2 cpu's via software. From my hyperthreading link, Hyper-Threading Technology enables multi-threaded software applications to execute threads in parallel. This will allow multi-threaded applications to execute much faster. In order to get the benefits of hyperthreading under Linux, you have to use a smp kernel.

--SN
Reply With Quote
  #5  
Old 28th March 2004, 05:26 PM
sigusr Offline
Registered User
 
Join Date: Mar 2004
Location: east tennessee, usa
Posts: 8
My take on hyperthreading is it is an attempt to deliver data from from a slow process (800 mhz memory) using more than one pipe to a fast process (3 ghz processor). Just my .02 cents worth.
Reply With Quote
Reply

Tags
30ghz, dual, proc, showing, single

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
BCM4311 + NdisWrapper Problem - (dual core, 64 bit proc) donjohn Servers & Networking 1 10th November 2006 09:58 PM
/dev/hdb6 "partition mounted" error in parted, but not showing in mount/proc? IBBoard Using Fedora 1 25th October 2006 08:47 AM
Intell P2 Dual proc. but only one gets recognised woosting Hardware & Laptops 4 22nd March 2005 06:06 PM
Upgrade from single to dual CPU flyer2000 Using Fedora 3 2nd September 2004 02:55 PM


Current GMT-time: 05:44 (Sunday, 20-04-2014)

TopSubscribe to XML RSS for all Threads in all ForumsFedoraForumDotOrg Archive
logo

All trademarks, and forum posts in this site are property of their respective owner(s).
FedoraForum.org is privately owned and is not directly sponsored by the Fedora Project or Red Hat, Inc.

Privacy Policy | Term of Use | Posting Guidelines | Archive | Contact Us | Founding Members

Powered by vBulletin® Copyright ©2000 - 2012, vBulletin Solutions, Inc.

FedoraForum is Powered by RedHat