Re: amd opteron NUMA support

Julian
this may be of interest. Not Solaris and not for that matter kernel 
related but does give a lot of info (if you search other bits of this) 
how NUMA affects complex processes such as Oracle and Linux. Kevin 
Closson did a lot of Oracle tuning for the old Sequent boxes.

http://kevinclosson.wordpress.com/2007/01/18/oracle-on-opteron-the-numa-angle-part-i/

Julian Elischer wrote:
> Is anyone looking at trying to add specific support for the
> hyper-transport based numa AMD systems?
>
> It would be interesting to know what sort of things Sun did
> for Solaris for their old x-bus systems which had
> similar characteristics.
>
> with each processor having memory associated with it,
> and a penalty for accessing memory associated with other CPUS,
> several things come to mind, including:
>
> Obviously, doing a lot of work to stop threads from migrating around.
> Page replacement of pages that are 'far away' with closer ones over time.
> CPU or die specific memory allocators.
> Multiple copies of read-only segments (so that each cpu has it's own 
> copy of the /bin/sh text segment for example).
> Servicing interrupts on CPUs most closely associated with the IO 
> channels.
>
> Now I know SOME work has been done on some of this
> but it would be good to know if anyone if focusing on this.
>
>
> Julian
> (who just did a quick course on opteron and has come away quite stunned)
>
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