[Beowulf] Re: RRDtools graphs of temp from IPMI

Ashley Pittman apittman at concurrent-thinking.com
Tue Nov 11 09:53:37 EST 2008


On Tue, 2008-11-11 at 14:41 +0000, Dave Love wrote:
> Chris Samuel <csamuel at vpac.org> writes:
> 
> > The reason it worries about high load is that we
> > used to see processes hang trying to read from the
> > IPMI device, but haven't seen that with more recent
> > kernels..
> 
> How recent?  We've seen similar trouble on Supermicros with a SuSE 10.3
> (2.6.22.17) kernel, hence doing it out-of-band, as I just posted.
> (Sorry I basically duplicated the in-band one of yours.)  It involves
> the kipmi0 kernel thread going CPU-bound and sometimes getting a huge
> load average from failed ipmitool instances hanging around.

Even when it does work running "ipmptool sensor" in-band can often take
30 seconds to complete which isn't great for performance.

Ashley,

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