Dual processor but see Quad processor
Chris Miller
cmiller at gammae.com
Tue Dec 16 04:52:56 UTC 2003
That is the Hyperthreading. You will want to keep that on. Only time I
have seen it be a problem is if you tell mysql that you have 4 cpus.
On Thu, 2003-12-04 at 18:33, Pedro Fernandes Macedo wrote:
> Yeak,
>
> The 4 processors are ok. The latest Xeon and Pentium 4 processors have a
> technology called Hyperthreading . Using it , each processor works to
> the OS as being two logical processors... This explains the 2 "extra"
> processors you see...
> To disable this , you have to disable Hyperthreading in the bios or
> disabling ACPI in the kernel... ( I found out that ACPI has to be
> enabled to make the kernel recognize the virtual CPU when compiling a
> kernel to a Xeon machine we bought recently). Some tests show this
> should be disabled in linux , because this leads to some performance
> penalties , but I'm leaving it enabled anyway...
>
> Pedro Macedo
>
> Message: 29
> To: fedora-list at redhat.com
> From: Yeak Nai Siew <yeak at md.com.my>
> Subject: Dual processor but see Quad processor
> Date: Fri, 5 Dec 2003 09:53:06 +0800
> Reply-To: fedora-list at redhat.com
>
>
> --Apple-Mail-1--59810577
> Content-Transfer-Encoding: 7bit
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> 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.
>
>
> -- Yeak Nai Siew << Mac OS Forever >> << Linux Forever>> >>>
> http://www.redhat.com/rhce/rhce806200928901893.html <<<
>
>
>
> --
> fedora-list mailing list
> fedora-list at redhat.com
> To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
>
More information about the fedora-list
mailing list