Problems with R410

Tehmasp Chaudhri tchaudhri at
Sun Jan 8 21:21:22 CST 2012

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?

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

We have also disabled c-states in the BIOS.

Good Luck - this c-state issue has been a real pain.


On Thu, Dec 29, 2011 at 6:30 PM, Dennis Jacobfeuerborn <
dennisml at> wrote:

> On 12/30/2011 12:11 AM, Mark Nipper wrote:
> > On 29 Dec 2011, Dennis Jacobfeuerborn wrote:
> >> That bug isn't accessible but I found it referenced in other posts on
> >> this mailing list which mention problem with the C-State handling of
> >> the CPUs.
> >> I'm not sure though what the best workaround is. From what I get
> >> changing the settings in the BIOS is not working because the OS
> >> resets them. Does that mean I can keep the BIOS settings and simply
> >> providing the kernel options "intel_idle.max_cstate=2" should be
> >> enough? I also saw that sombody set "intel_idle.max_cstate=0
> >> processor.max_cstate=1".
> >
> >       We're using just:
> > ---
> > intel_idle.max_cstate=2
> >
> > and it's basically solved the problem.  Setting the options in
> > BIOS did NOT fix our problem since, as you pointed out, the
> > kernel simply does its own thing.
> Ok, I'll try that and see if it fixes our ptoblems as well, thanks.
> >> The idrac problem makes this worse as we cannot reboot the machine
> >> remotely when i goes down. So far we have used Supermicro based
> >> systems and there I just changed the ipmi network settings and was
> >> ready to go. On the two R410 we now have (more arriving next week)
> >> the idracs just tell me there is no link even though there clearly
> >> is.
> >
> >       No promises that you're even running into this same
> > problem.  But, it's definitely the first thing to exclude as a
> > possibility since it seems to affect a lot of people.  The DRAC
> > issue you're having sounds unrelated to the hangs, and is
> > something I have not personally seen on any of our R series
> > machines.  I would say you might have a hardware issue there if
> > it weren't for the problem being duplicated across all of your
> > R410's.  It might be worth trying a different switch to rule out
> > a bad interaction between your particular switch and the DRAC's.
> > I'm also assuming your Ethernet cables have all been checked too.
> >
> Yes we used a different cable and both ports connected but we didn't try
> another switch yet. That's probably what we are going to do next although
> it would be really weird since the system itself seems to run fine so far
> without any issues so at least physically server and switch seem to get
> along quite well.
> Maybe the fact that I never configured the drac through the console but
> only using the shell under Centos has something to do with this? That would
> be strange but I'm running out of options.
> Regards,
>   Dennis
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