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Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64
From: |
Cédric Le Goater |
Subject: |
Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64 |
Date: |
Fri, 7 Apr 2017 08:07:57 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 04/07/2017 07:24 AM, Nikunj A Dadhania wrote:
> Cédric Le Goater <address@hidden> writes:
>
>> Hello Nikunj,
>>
>> On 04/06/2017 12:22 PM, Nikunj A Dadhania wrote:
>>> The series enables Multi-Threaded TCG on PPC64
>>>
>>> Patch 01: Use atomic_cmpxchg in store conditional
>>> 02: Handle first write to page during atomic operation
>>> 03: Generate memory barriers for sync/isync and load/store conditional
>>>
>>> Patches are based on ppc-for-2.10
>>>
>>> Tested using following:
>>> ./ppc64-softmmu/qemu-system-ppc64 -cpu POWER8 -vga none -nographic -machine
>>> pseries,usb=off -m 2G -smp 8,cores=8,threads=1 -accel tcg,thread=multi
>>> f23.img
>>
>> I tried it with a Ubuntu 16.04.2 guest using stress --cpu 8. It looked
>> good : the CPU usage of QEMU reached 760% on the host.
>
> Cool.
>
>>> Todo:
>>> * Enable other machine types and PPC32.
>>
>> I am quite ignorant on the topic.
>> Have you looked at what it would take to emulate support of the HW
>> threads ?
>
> We would need to implement msgsndp (doorbell support for IPI between
> threads of same core)
ok. I get it. Thanks,
>> and the PowerNV machine ?
>
> Haven't tried it, should work. Just give a shot, let me know if you see
> problems.
sure. pnv is still on 2.9, so I will rebase on 2.10, merge your
patches and tell you.
Thanks,
C.
- Re: [Qemu-ppc] [PATCH RFC v1 3/3] target/ppc: Generate fence operations, (continued)
- Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64, Nikunj A Dadhania, 2017/04/07
- Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64, Alex Bennée, 2017/04/10
- Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64, Cédric Le Goater, 2017/04/11
- Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64, Benjamin Herrenschmidt, 2017/04/11
- Re: [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64, Alex Bennée, 2017/04/11