Re: [Xen-devel] [RFC PATCH 0/5] Extend resources to support more vcpus in single VM

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2017年08月29日 16:49, Jan Beulich wrote:
>>>> On 29.08.17 at 06:38, <tianyu.lan@xxxxxxxxx> wrote:
>> On 2017年08月25日 22:10, Meng Xu wrote:
>>> How many VCPUs for a single VM do you want to support with this patch set?
>>
>> Hi Meng:
>>      Sorry for later response. We hope to increase max vcpu number to 512.
>> This also have dependency on other jobs(i.e, cpu topology, mult page
>> support for ioreq server and virtual IOMMU).
> 
> I'm sorry for repeating this, but your first and foremost goal ought
> to be to address the known issues with VMs having up to 128
> vCPU-s; Andrew has been pointing this out in the past. I see no
> point in pushing up the limit if even the current limit doesn't work
> reliably in all cases.
> 

Hi Jan & Andrew:
        We ran some HPC benchmark(i.e, HPlinkpack, dgemm, sgemm, igemm and so
on) in a huge VM with 128 vcpus(Even >255 vcpus with non-upstreamed
patches) and didn't meet unreliable issue. These benchmarks run heavy
workloads in VM and some of them even last several hours.

-- 
Best regards
Tianyu Lan

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