Problems with R410

Shyam_Iyer at Dell.com Shyam_Iyer at Dell.com
Mon Jan 9 18:19:49 CST 2012



> -----Original Message-----
> From: linux-poweredge-bounces-Lists On Behalf Of Jens Dueholm
> Christensen (JEDC)
> Sent: Monday, January 09, 2012 3:38 AM
> To: linux-poweredge-Lists
> Subject: RE: Problems with R410
> 
> 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 -
> https://bugzilla.redhat.com/show_bug.cgi?id=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
> http://lists.us.dell.com/pipermail/linux-poweredge/2011-
> December/045732.html) has found out anything yet..

The issue is because of a bug in HPET timer code.. . The TSC timer is found to be unstable by the sync checker and defaults to the HPET code and since there is a bug in the HPET this issue is caused when system enter c3 or deep-c states. In these states the lapic timer is disabled and so the HPET is used to broadcast schedule events..

Code to fix HPET should be in order..

> 
> Regards,
> Jens Dueholm Christensen
> Survey IT
> 
> -----Original Message-----
> From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-
> bounces at dell.com] On Behalf Of Dennis Jacobfeuerborn
> Sent: Monday, January 09, 2012 5:42 AM
> To: Tehmasp Chaudhri
> Cc: linux-poweredge at dell.com
> 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
> problem.
> 
> > We have also disabled c-states in the BIOS.
> >
> > Good Luck - this c-state issue has been a real pain.
> 
> 
> Regards,
>    Dennis
> 
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