RE: Getting rid of SHMMAX/SHMALL ?

[Chen, Kenneth W]

Andi Kleen wrote on Thursday, August 04, 2005 3:54 PM
> > This might be too low on large system.  We usually stress shm pretty hard
> > for db application and usually use more than 87% of total memory in just
> > one shm segment.  So I prefer either no limit or a tunable.
> 
> With large system you mean >32GB right?

Yes, between 32 GB - 128 GB.  On larger numa box in the 256 GB and upward,
we have to break shm segment into one per-numa-node and then the limit
should be OK.  I was concerned with SMP box with large memory.

> I think on a large systems some tuning is reasonable because they likely
> have trained admins. I'm more worried on reasonable defaults for the
> class of systems with 0-4GB

Sounds reasonable to me.

- Ken

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