Re: Problems with merlot* AMD Opteron 6376 systems (Was Re: stable trees (was: [xen-4.2-testing test] 58584: regressions))

[Dario Faggioli <dario.faggioli@citrix.com>]

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[Moving most people to Bcc, as this is indeed unrelated to the original
topic]

On Wed, 2015-06-24 at 13:41 +0100, Jan Beulich wrote:
> >>> On 24.06.15 at 14:29, <dario.faggioli@citrix.com> wrote:
> > On Wed, 2015-06-24 at 10:38 +0100, Ian Campbell wrote:
> >> The memory info
> >> Jun 23 15:56:27.749008 (XEN) Memory location of each domain:
> >> Jun 23 15:56:27.756965 (XEN) Domain 0 (total: 131072):
> >> Jun 23 15:56:27.756983 (XEN)     Node 0: 126905
> >> Jun 23 15:56:27.756998 (XEN)     Node 1: 0
> >> Jun 23 15:56:27.764952 (XEN)     Node 2: 4167
> >> Jun 23 15:56:27.764969 (XEN)     Node 3: 0
> >> suggests at least a small amount of cross-node memory allocation (16M
> >> out of dom0s 512M total). That's probably small enough to be OK.
> >> 
> > Yeah, that is in line with what you usually get with dom0_nodes. Most of
> > the memory, as you noted, comes from the proper node. We're just not
> > (yet?) at the point where _all_ of it can come from there.
> 
> Actually as long as there is enough memory on the requested node
> (minus any amount set aside for the DMA pool), this shouldn't
> happen (and I had seen this to be clean in my own testing). 
>
ISTR some allocation not being 'converted'. Perhaps I'm misremembering.

> There
> being 8Gb per node, I see no immediate reason why memory from
> node 2 would be handed out. Still I wouldn't suspect this to matter
> here.
> 
On my 2 nodes test box with the following configuration:
(XEN) SRAT: Node 1 PXM 1 0-dc000000
(XEN) SRAT: Node 1 PXM 1 100000000-1a4000000
(XEN) SRAT: Node 0 PXM 0 1a4000000-324000000

with 'dom0_nodes=0', I see this:
(XEN) Memory location of each domain:
(XEN) Domain 0 (total: 131072):
(XEN)     Node 0: 114664
(XEN)     Node 1: 16408

while with 'dom0_nodes=1', this:
(XEN) Memory location of each domain:
(XEN) Domain 0 (total: 131072):
(XEN)     Node 0: 7749
(XEN)     Node 1: 123323

Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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