Problems with R410

Jens Dueholm Christensen (JEDC) Jens.Dueholm at
Mon Jan 9 02:38:06 CST 2012

Dennis Jacobfeuerborn wrote:

> Is there any official response from Dell regarding this issue? Given that a 
> lot of new servers are going to be installed with RHEL/CentOS 6 that sounds 
> like something owners of the hardware should be informed of.

It's really not a HW-issue - the same hardware has no problems under other OSes (RHEL < v6, *BSD, Windows etc etc)

Redhat is working on something, but the bugzilla issue (#710265 - has been marked non-public for quite some time now, so it's anyones guess on the linux-poweredge list whats going on there.

I wonder if Shyam Iyer from Dell (see has found out anything yet..

Jens Dueholm Christensen 
Survey IT

-----Original Message-----
From: linux-poweredge-bounces at [mailto:linux-poweredge-bounces at] On Behalf Of Dennis Jacobfeuerborn
Sent: Monday, January 09, 2012 5:42 AM
To: Tehmasp Chaudhri
Cc: linux-poweredge at
Subject: Re: Problems with R410

On 01/09/2012 04:21 AM, Tehmasp Chaudhri wrote:
> I'm surprised to see another Dell PE series server w/ this c-state issue.
> We have been dealing w/ this on our *r810 *servers - but from the tech
> specs on Dell's site the Intel series processor on the 410 is the 5500
> and/or 5600. Is that the case for your new r410 servers?

According to the Intel Errata the Nehalem 35xx, 55xx and Westmere 56xx are 
suffering from this problem so yes the r410 has this issue as well.

> We're using the following in our grub.conf file on an OEL 5.7 (have used
> CentOS 5.7 prior):
> intel_idle.max_cstate=0 processor.max_cstate=1

On 5.x this shouldn't be neccessary as the OS driver doesn't support the 
new c-states. Our CentOS 5.7 r410 System runs fine so far without any 
modifications it's only the one where we installed CentOS 6.2 that has this 

> We have also disabled c-states in the BIOS.
> Good Luck - this c-state issue has been a real pain.


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