Hi,

> Hello All,
> 
> at RWTH Aachen, Germany, we are experiencing frequent kernel 
> freezings of our (a bit older) data servers when using (SL5,) the 
> xfs file system and NFS4 with i386 data server architectures. No 
> problems with 64 bit servers.
> 
> >From the /var/log messages we think that the problem is due to a smaller
stack size for the i386 kernel as described here:
>   http://www.mythtv.org/pipermail/mythtv-users/2005-May/089314.html
> 
> Any chance that for future SL kernel upgrades 8k instead of 4k stack 

Red Hat will never increase the stack size from 4k to 8k. This is why Red Hat
never (originally) supported XFS with their Linux releases.

Just know that the 4k stack size will never change for 32 bit architectures
under Red Hat releases. If you're going to hit the problem consistently
because you're using 32 bit with 4k stack sizes then your only choices (as I
know them) is to not use Red Hat-based 32bit derivative releases with XFS or
if you continue to use Red Hat-based 32bit derivatives, don't use XFS.

The problem lies with how many "layers" you can have with a 4k stack size.

Regards,

Michael.

> size is used also for the 32 bit architecture (kernel parameter 
> CONFIG_4KSTACKS=n) or any idea how to cure the problem ? In our 
> opinion ext3 is not a very good choice for big data servers in case 
> of fs crashes.
> 
> I found this issue discussed already in Jan 2006 on this list but I 
> wonder whether there was any progress during the last four years.
> 
>     Thanks & cheers, 
>         Thomas.
> 
> --
>               Mit besten Gruessen/With kind regards,
> 
> Thomas Kress, RWTH Aachen, III. Physikalisches Institut, Lehrstuhl B
> Office Aachen:  28A 206, Phone: +49 241 80 27281, Fax: ... 22244
> Office CERN: B40 4-A16, Phone: +41 22 76 71682,   Fax: ... 78940
> Email: [log in to unmask] ; [log in to unmask]
>             Signed with a certificate issued by GridKa-CA (GermanGrid)
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