[zfs-discuss] ZFS/Lustre echo 0 >> max_cached_mb chewing 100% cpu

Prakash Surya surya1 at llnl.gov
Tue Oct 22 11:21:04 EDT 2013


This probably belongs on the Lustre mailing list. Regardless, I don't
think you want to do that (do you?). It'll prevent any client side
caching, and more importantly, I don't think it's a case that's been
tested/optimized. What're you trying to acheive?

Also, just curious, where's the CPU time being spent? What process and/or
kernel thread? What are the top entries listed when you run "perf top"?

-- 
Cheers, Prakash

On Tue, Oct 22, 2013 at 12:53:44PM +0100, Andrew Holway wrote:
> Hello,
> 
> I have just setup a "toy" lustre setup using this guide here:
> http://zfsonlinux.org/lustre and have this process chewing 100% cpu.
> 
> sh -c echo 0 >> /proc/fs/lustre/llite/lustre-ffff88006b0c7c00/max_cached_mb
> 
> Until I get something more beasty I am using my desktop machine with
> KVM. Using standard Centos 6.4 with latest kernel. (2.6.32-358.23.2).
> my machine has 2GB ram
> 
> Any ideas?
> 
> Thanks,
> 
> Andrew
> 
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