Re: [Xen-devel] Is there any mechanism in XEN can use to limit the memory bandwidth of each domain?

[George Dunlap <dunlapg@xxxxxxxxx>]

No, Xen does not measure or attempt to control memory bandwidth at the moment.

Other than simply not scheduling a VM, I'm not aware of any way to
throttle memory accesses.  One can imagine enhancing a scheduler to
count memory accesses, and to schedule based not only on pure time on
the cpu, but on memory instructions executed.

Sounds like a research paper. :-)

 -George

On Mon, Dec 6, 2010 at 5:55 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Dec 06, 2010 at 06:00:14PM +0800, 贺鹏 wrote:
>> Hi, all:
>>         As we all know, Xen can alloc different amount of memory to
>> different VMs, but these VMs access memory by one shared memory bus, which
>> means if one VM access the memory very frequently, the bandwidth of the
>> memory shared by the other VM will decrease.
>>         So I'm wondering is there any mechanism in XEN can reserve the limit
>> bandwidth of the memory for different VMs?
>
> As in NUMA? There is work to make that be provided to Xen guests.
>
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