Re: Testing memory performance

[Michael van Elst <mlelstv%serpens.de@localhost>]

On Mon, Nov 19, 2018 at 09:25:31PM +0000, Sad Clouds wrote:
> OK I disabled NUMA in BIOS, there is a slight performance hit, but
> NetBSD is still much slower than Linux. This time I did single thread
> test, but disparity grows with number of threads.

You cannot disable NUMA, that's how the machine is built. You may change
how memory is physically mapped (usually done by hashing address bits).


> Maybe there is a global lock in NetBSD VM subsystem that slows things
> down with higher number of threads.

There is a global lock for the page freelist.



-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."