LinuxQuestions.org
Did you know LQ has a Linux Hardware Compatibility List?
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Hardware
User Name
Password
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

Notices

Reply
 
Search this Thread
Old 03-11-2006, 10:14 PM   #1
H_TeXMeX_H
Guru
 
Registered: Oct 2005
Location: $RANDOM
Distribution: slackware64
Posts: 12,928
Blog Entries: 2

Rep: Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269
System time goes twice as fast as normal on FC4 SMP kernel


Using the Fedora Core 4 SMP kernel the system time goes exactly twice as fast as normal all the time ( 2 seconds of system time = 1 second real time ). I'm using a Pentium 4 processor and SiS chipset. Is there a way to fix it ?


P.S. I know there are posts here similar to this one, but this is different from other posts I've seen cuz all the others were dealing with either ATI chipsets or AMD processors which I do not have. And the system time is like this all the time not just in bursts. I have yet to find a solution that works.

Last edited by H_TeXMeX_H; 03-11-2006 at 10:16 PM.
 
Old 03-12-2006, 06:58 AM   #2
carl0ski
Member
 
Registered: Sep 2004
Location: Melbourne, Victoria Australia
Distribution: Support those that support you :)
Posts: 872
Blog Entries: 12

Rep: Reputation: 30
Quote:
Originally Posted by H_TeXMeX_H
Using the Fedora Core 4 SMP kernel the system time goes exactly twice as fast as normal all the time ( 2 seconds of system time = 1 second real time ). I'm using a Pentium 4 processor and SiS chipset. Is there a way to fix it ?


P.S. I know there are posts here similar to this one, but this is different from other posts I've seen cuz all the others were dealing with either ATI chipsets or AMD processors which I do not have. And the system time is like this all the time not just in bursts. I have yet to find a solution that works.

no your right it isnt ATI chips responsible it is a direct result of SMP

i still have no idea to fix it ,

mandriva appending
notsc
and
no_timer_check

to the bootloader fixed it

however it doesnt help i SUSE

running default Kernel ie Single processor however works fine, sort of defies the point of a dual processor system.

If you have P4 with HyperTheading (not a dual Core)
since the processor itself delegates the 2nd logical (non Existant CPU you dont need a SMP kernel to make use of it.
 
Old 03-12-2006, 07:12 AM   #3
comptiger5000
Member
 
Registered: May 2005
Distribution: Fedora Core Since version 3
Posts: 193

Rep: Reputation: 30
only use smp kernels if you have 2 or more processors, or dual core
 
Old 03-12-2006, 10:54 AM   #4
Pygobombe
LQ Newbie
 
Registered: Aug 2004
Location: Canada
Distribution: ubuntu, opensuse, freebsd, osx. (and a few others from time to time)
Posts: 14

Rep: Reputation: 0
I have two pentium 4 CPUs (in different systems) and I have never had that problem before. Though, I compiled my own kernel in Slackware.

Wouldn't it be better to have SMP enabled on a HT enabled CPU? I notcied after compiling the kernel the second time around (with SMP support) that using the -jx option gave me a ~40% decrease in compile times.
x being a number of simultanious threads to execute at once, I usually use 2 for single CPU, and 3+ for dual/HT, since even on a single CPU (without HT) compile times dropped by 20% to 30%. It increases in speed because there is time in between when it finishes compiling one source file, to starting to compile another.
 
Old 03-12-2006, 11:19 AM   #5
comptiger5000
Member
 
Registered: May 2005
Distribution: Fedora Core Since version 3
Posts: 193

Rep: Reputation: 30
no, it doesnt make a difference
 
Old 03-12-2006, 11:28 AM   #6
H_TeXMeX_H
Guru
 
Registered: Oct 2005
Location: $RANDOM
Distribution: slackware64
Posts: 12,928
Blog Entries: 2

Original Poster
Rep: Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269Reputation: 1269
Well ... Fedora Core 4 chose to install the SMP kernel, I didn't. But my Pentium 4 has Hyperthreading support, and it works faster with the SMP kernel so I'd rather keep it. I tested both SMP and non-SMP kernels and I'm pretty sure the SMP is faster.

Last edited by H_TeXMeX_H; 03-12-2006 at 11:30 AM.
 
Old 05-20-2006, 09:03 PM   #7
Pygobombe
LQ Newbie
 
Registered: Aug 2004
Location: Canada
Distribution: ubuntu, opensuse, freebsd, osx. (and a few others from time to time)
Posts: 14

Rep: Reputation: 0
Quote:
Originally Posted by comptiger5000
no, it doesnt make a difference
I suggest reading this: http://www.linuxelectrons.com/articl...40226231747944

If you still don't beleive, give it a try yourself.

(and sorry for digging up an old thread. I just saw that article and figured I should get my point accross.)

Also, H_TeXMeX_H, did you fix the problem with the clock?

Last edited by Pygobombe; 05-20-2006 at 09:04 PM.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any reason to keep a non-smp kernel installed on a smp FC3 machine? jim-j Fedora 2 03-12-2006 07:06 AM
Kernel confusion on SMP system--get rid of excess RPMs? JMCraig Linux - Newbie 5 02-25-2006 09:44 AM
irratic System clock (time passes extremly fast) carl0ski Linux - Hardware 2 12-04-2005 10:09 PM
How P IV system work fast with Red Hat Linux 8, I recompile the kernel also. benoy4007 Red Hat 2 06-12-2004 03:49 AM
Setting System Time: kernel in wrong time zone warrenweiss Linux - General 7 05-15-2004 03:25 PM


All times are GMT -5. The time now is 07:30 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration