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@xxxxxxxxxx > From: Yeak Nai Siew <yeak@xxxxxxxxx> > Subject: Dual processor but see Quad processor > Date: Fri, 5 Dec 2003 09:53:06 +0800 > Reply-To: fedora-list@xxxxxxxxxx > > > --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@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
