Dual processor but see Quad processor

mike webster mwebster at intercosmos.com
Fri Dec 5 02:37:23 UTC 2003


Seems to me that your two Xeon processors are of the Pentium 4 variety.
These utilize the hyper-threading that Intel has built into the procs.

If you want, you can recompile your kernel without hyper-threading
support - it will only see the two physical processors.  Some BIOS's
have the ability to turn off hyper-threading, so that might be another
approach.

Personally, I would leave the hyper-threading alone.  Performance
will be hindered otherwise.  I believe you're problem is elsewhere.


Mike Webster
Systems Administrator
Intercosmos Media Group, Inc.

On Thu, 2003-12-04 at 19:53, Yeak Nai Siew wrote:
> Hi all,
> 
> I installed Fedora Core 1 on IBM eServer with the following spec:
> - 1U
> - 2 x 36 GB Hardware RAID 1 (LSI and driver used is mpt)
> - 2 x 2.8 Ghz Xeon
> - 4 x 1 GB RAM
> 
> Right after install and logged in, the Gnome desktop seems unstable. 
> Clicking the menu will occasionally paused for 1 or 2 seconds. I left 
> it idle and not touching it, but it crashed automatically. Message log 
> shows gdm-binary having problem. Not sure if it is so.
> 
> Then I run "top" and I notice it shows 4 CPU. I know this server only 
> have 2. None of this 4 CPU shows any status. Idle is "0%". The status 
> is wrong.
> 
> Then I tried RHEL AS 3, looks more stable, but the "top" also show 4 
> CPU. This time it shows the figure. Idle is around 98% to 100%. But the 
> status run across all the 4 CPU (the physical CPU is only 2...)
> 
> Why seeing 4, not 2? Is there a way to pass kernel parameter during 
> bootup to force it to use 2 only?
> 
> Thanks.
> 





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