overclocking at -40 degrees C - windows boots, linux doesn't at some bios settings

[Richardson, Joshua A.]

What architecture and kernel are you running?

Joshua A. Richardson
General Dynamics AIS
Principal  Systems Engineer
Systems Administrator
Office: 703-272-1761
Cell: 540-383-9093


-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of yaconsult
Sent: Friday, December 04, 2009 5:21 PM
To: redhat-list at redhat.com
Subject: overclocking at -40 degrees C - windows boots,linux doesn't at
some bios settings

The basic question here is what are the differences between running
linux on a highly overclocked system versus running windows on the same
hardware?

We have an expert in the field doing the overclocking
and he finds that bios timing settings that pass all stress testing
under windows won't even boot under linux. He has to back off on the
overclocking for the system to boot linux.

The hardware used is
the same in both cases - only a disk swap is involved. The OS is Redhat
5.4 with all updates and cpuspeed is disabled. The system is being used
to run Synopsys software that is capable of keeping all of the cores
saturated. Some runs take many, many hours.

Are there kernel
parameters or other system tuning that needs to be done when the system
is highly overclocked? We're talking about a clock speed of around 4.8
GHz on a core i7 with 12 GB of triple-channel memory. He's currently
investigating his hunch of possible bandwidth issues by removing some
memory.

The guy doing the
tuning paid for a support call to Redhat and came back saying the
Redhat guy told him that linux "couldn't keep up" at that speed... Uh,
what?!

Thanks for any hints, clues, pointers, etc.



      
-- 
redhat-list mailing list
unsubscribe mailto:redhat-list-request at redhat.com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list