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Re: x86_64 emulation on ppc64le POWER9 hardware - no multi threading
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From: |
Cédric Le Goater |
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Subject: |
Re: x86_64 emulation on ppc64le POWER9 hardware - no multi threading |
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Date: |
Mon, 3 Aug 2020 18:19:40 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 8/3/20 5:24 PM, Cédric Le Goater wrote:
> Hello,
>
> On 8/3/20 3:47 PM, Kim-Norman Sahm wrote:
>> hi,
>>
>>
>>
>> i’m running Debian 10 on POWER9 and would like to spawn x86_64 emulated VMs.
>>
>> The virtual machine is configured to run with 8 vpus but it’s very slow.
>>
>> On the host you can see that the qemu-system-x86_64 process is using just
>> one core!
>>
>>
>>
>> Ppc64le guests are using multi cores, so its looks like an config problem or
>> software bug with the x86 emulator.
>
> It's not a bug.
>
> SMT is not supported on PCC64 machines (pSeries and PowerNV) when
> running emulated (TCG). Although, this is something we would love
> to have.
I got it the other way around :) I guess I really want SMT to work
on PPC64. Sorry for the noise.
Cheers,
C.