redhat showing 4 procs (fwd)

Alexander Lazarevich alazarev at hera.itg.uiuc.edu
Wed Nov 13 15:40:00 CST 2002


opps i replyd to a person, not the email list...

---------- Forwarded message ----------
Date: Wed, 13 Nov 2002 15:37:09 -0600 (CST)
From: Alexander Lazarevich <alazarev at hera.itg.uiuc.edu>
To: Jeremy_Sheard at Dell.com
Subject: RE: redhat showing 4 procs

so is this a function i need for linux? i can imagine that if you were
running windows, maybe that functionality might help. but would this
hyper-threading" help or hamper a linux environment? any ideas?

the machine will be used as fileserving (500GB RAID 5 array), sendmail,
NIS or kerberos server, and a few apps.

thanks!

alex
---                                                        ---
   Alex Lazarevich | Systems | Imaging Technology Group
   alazarev at itg.uiuc.edu | (217)244-1565 | www.itg.uiuc.edu
---                                                        ---


On Wed, 13 Nov 2002 Jeremy_Sheard at Dell.com wrote:

> This is what's called:  "Hyper-Threading" on the new P-4 Xeon Processors.
> You can disable this in the System BIOS (Setup) from which is called
> "Logical Processors".
>
> With Hyper-Threading enabled in the System BIOS, your Operating System will
> always see double the # of physical processors you have in your server.
>
>
> Jeremy Sheard
> DELL Server Support
>
> -----Original Message-----
> From: Alexander Lazarevich [mailto:alazarev at hera.itg.uiuc.edu]
> Sent: Wednesday, November 13, 2002 3:23 PM
> To: DELL linux/poweredge email list
> Subject: redhat showing 4 procs
>
>
> PE 4600, dual 2.8GHz procs, 4GB RAM, runnning redhat linux 7.3
> (2.4.18-3smp kernel).
>
> my linux OS is reporting quad processors, both when i run top, and in
> /proc/meminfo (shows proc0-3). and top is showing that all proc0-3 are
> using different amounts of their computing power. but i know for certain
> there are only 2 processors in the system. i've opened the beast up (at
> least the right side of the machine, im assuming the left side is just
> empty space cause there are no fans cycling air in the left side) and i
> only see 2 processors.
>
> any ideas why the linux kernel is doing that? and could it create any
> problems for fileserving?
>
> thanks in advance,
>
> alex
> ---                                                        ---
>    Alex Lazarevich | Systems | Imaging Technology Group
>    alazarev at itg.uiuc.edu | (217)244-1565 | www.itg.uiuc.edu
> ---                                                        ---
>
>
>
>
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