[Linux-cluster] dlm high cpu on latest stock centos 5.1 kernel

[David Ayre]

What do you mean by pounded exactly ?

We have an ongoing issue, similar... when we have about a dozen users  
using both smb/nfs, and at some seemingly random point in time our  
dlm_senddd chews up 100% of the CPU... then dies down at on its own  
after quite a while.  Killing SMB processes, shutting down SMB didn't  
seem to have any affect... only a reboot cures it.  I've seen this  
described (if this is the same issue) as a "soft lockup" as it does  
seem to come back to life:

http://lkml.org/lkml/2007/10/4/137

We've been assuming its a kernel/dlm version as we are running  
2.6.9-55.0.6.ELsmp with dlm-kernel 2.6.9-46.16.0.8

we were going to try a kernel update this week... but you seem to be  
using a later version and still have this problem ?

Could you elaborate on "getting pounded by dlm" ?  I've posted about  
this on this list in the past but received no assistance.




On 1-Apr-08, at 5:19 PM, Andrew A. Neuschwander wrote:

> I have a GFS cluster with one node serving files via smb and nfs.  
> Under
> fairly light usage (5-10 users) the cpu is getting pounded by dlm. I  
> am
> using CentOS5.1 with the included kernel (2.6.18-53.1.14.el5). This  
> sounds
> like the dlm issue mentioned back in March of last year
> (https://www.redhat.com/archives/linux-cluster/2007-March/msg00068.html 
> )
> that was resolved in 2.6.21.
>
> Has (or will) this fix be back ported to the current el5 kernel?  
> Will it
> be in RHEL5.2? What is the easiest way for me to get this fix?
>
> Also, if I try a newer kernel on this node, will there be any harm  
> in the
> other nodes using their current kernel?
>
> Thanks,
> -Andrew
> -- 
> Andrew A. Neuschwander, RHCE
> Linux Systems Administrator
> Numerical Terradynamic Simulation Group
> College of Forestry and Conservation
> The University of Montana
> http://www.ntsg.umt.edu
> andrew at ntsg.umt.edu - 406.243.6310
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster

~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~
David Ayre
Programmer/Analyst - Information Technlogy Services
Emily Carr Institute of Art and Design
Vancouver, B.C.   Canada
604-844-3875 /  david at eciad.ca

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