| |
|
 |
|
 |
|
|
|
| |
|
|
xen-ia64-devel
Re: [Xen-ia64-devel] [patch] calculate dom0 metaphysical load address co
Alex started new thread whose subject "How to support NUMA?"
Let's move the discussion there.
The patch itself looks ok to me except the comment.
Probably posting your local patches would help discussions greatly.
Some of them might be easily merged, others might need discussion.
On Thu, May 24, 2007 at 04:28:21PM +0200, Jes Sorensen wrote:
> Sorry, but there's more to it than that, there are other drivers and
> there is the whole memory management layer too.
I counted the files.
38 header files under linux/include/asm-ia64/sn/
32 C files and 5 header files under linux/arch/ia64/sn/
Probably most of them don't need to be touched or the only
very small part of them need to be touched.
Yes, it might be certen amount of work to paravirtualize them.
But I don't think still that it's unrealistic.
> We *must* support P=M,
> it's just not an option. So lets try and fix the real problem and not
> introduce this really broken assumption that we can treat all memory as
> linear.
Can you elaborate on the details concretely?
Why do you think it *must*?
Why do you think it is so difficult to paravirtualize them?
It seems many things are involved.
Can you break them down more concrete issues?
Can you explain Altix more? e.g. bus, shub chip, ...
You are the only person who are familiar with Altix.
Such infomations would be greatly helpful to find good solution.
> In theory yes, but that means taking a hypercall for every single
> memory allocation! How do you plan to handle CPU local and node
> local memory pools if pages are just provided to the dom at random?
> Without proper memory management, NUMA is not supported and the system
> will never perform. Try treating a 64 node machine as a standard SMP
> box and watch it behave like a 386.
What is wanted here is only node locality whose requirement is
much loser than P=M's requirement as Alex described in another mail.
--
yamahata
_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel
|
|
|
| |
|
Home