Messages in this thread | | | Date | Wed, 13 Jun 2012 11:21:43 +0900 | From | Kamezawa Hiroyuki <> | Subject | Re: [PATCH 1/2 v2] x86: add max_addr boot option |
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(2012/06/13 1:10), H. Peter Anvin wrote: > If what you care about is nodes, why not have an option to specify a map? >
At the first time of our project, we discussed passing node-id as boot option. But, we found Node-ID is just determined by the pxm ID order in SRAT. That means, we and our firmware team need to take care of the order of SRAT. But that node-ID v.s. SRAT relationship is just determined by implemenation, there is no spec, we thought we can't keep this way in future.
The second thought was specifying PXM. But, with hardware-partitioning-system, dynamic implementation of SRAT for a partutuion is very confusing...
Then, alternative idea was using mem= boot option. Because our partition system has fixed address range per each node, it works well.
But now, we know mem= boot option is buggy....it acts as max_addr= option, we have concerns that 'someone may fix mem= option as sane as ia64. because it's buggy".
We'd like to fix mem= boot option by ourselves and preserve old behavior with max_addr= boot option, which ia64 has.
Thanks, -Kame
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