[Libvir] [RFC][PATCH 1/2] Tested NUMA patches for available memory and topology

[Richard W.M. Jones]

My results are a bit inconclusive.  I have a machine here which 
supposedly supports NUMA (2 socket, 2 core AMD with hypertransport and 
two separate banks of RAM).

BIOS is _not_ configured to interleave memory.  Other BIOS settings lead 
me to suppose that NUMA is enabled (or at least not disabled).

Booting with Daniel's Xen & kernel does not give any messages about NUMA 
enabled or disabled.  (See attached messages).

# numactl --show
physcpubind: 0 1 2 3
No NUMA support available on this system.

$ grep -i numa /boot/config-2.6.18-numa.52.el5xen
[ no configuration lines shown ]

Nevertheless, with Beth's patch I see:

# src/virsh freecell 0
0: 133292032 kB

# src/virsh freecell 1
libvir: Xen error : invalid argument in 
xenHypervisorNodeGetCellsFreeMemory: invalid argument

# src/virsh freecell
Total: 133292032 kB

# src/virsh freecell -2
-2: 0 kB

(Negative numbers should be returning an error).

# src/virsh capabilities
[...]
   <topology>
     <cells num='1'>
       <cell id='0'>
         <cpus num='4'>
            <cpu id='0'/>
            <cpu id='1'/>
            <cpu id='2'/>
            <cpu id='3'/>
         </cpus>
       </cell>
     </cells>
   </topology>
[...]

Rich.

-- 
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