[Nottingham] LVM and load balancing and ReiserFS

Peter Chang Peter.Chang at nottingham.ac.uk
Sun Oct 28 20:18:29 GMT 2007

On Sun, 28 Oct 2007, Duncan John Fyfe wrote:
> It depends really.  On 32bit RHEL4 (2.6.13) the thread stack size is 4K
> and I have seen RHEL4 systems with 3 x (hardware) RAID5 + LVM2 + XFS +
> NFS bork once a week with stack overflows.  Patching the RH kernel to
> use 8K stacks eliminated this except for the occasional fubar when the
> system is under very heavy load.
> Much work has been done since 2.6.13 to reduce the stack usage of
> stacked filesystem components (of which RAID+LVM2+XFS is just one
> example) but you still see reports of "4k stack bad, 8k stack good"
> especially for FC6 and FC7 which have 4k stacks by default.

I think Fedora has had 4k stacks since FC4. I'm running mythtv on a 
Shuttle Pentium M machine. I don't do much networking on it, certainly not 
NFS, and the load is fairly trivial.

Checking the messages log shows no error messages.


> You've been running without trouble for 18 months.  You may well run
> fine for the rest of the configurations life.  Your call.
> My experience of stack overflows so far has been some acceptable data
> loss and a few inconvenient (Monday morning) reboots.

Thanks for the info. I'll leave sleeping dogs to lie.


This message has been checked for viruses but the contents of an attachment
may still contain software viruses, which could damage your computer system:
you are advised to perform your own checks. Email communications with the
University of Nottingham may be monitored as permitted by UK legislation.

More information about the Nottingham mailing list