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Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core |
Date: |
Sat, 11 Jan 2014 01:35:29 +1100 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
On 01/11/2014 01:25 AM, Alexander Graf wrote:
>
> On 10.01.2014, at 15:21, Mike Day <address@hidden> wrote:
>
>> On Fri, Jan 10, 2014 at 9:13 AM, Alexey Kardashevskiy <address@hidden>
>> wrote:
>>> On 01/11/2014 01:00 AM, Alexander Graf wrote:
>>
>>>> Can't we determine the number of "default threads" at a common
>>>> place, preferably derived from cpu type?
>>>
>>> We can do anything. I asked how exactly as I really (really) do not
>>> understand the details.
>>>
>>
>> Are you suggesting we create a dictionary with all the cpu type
>> information stored in it (stepping, cores, threads, memory channels,
>> caches) that we need to keep updated?
>
> We can always talk in extremes :). Today we have a dictionary of core
> types in QEMU. If a certain core type comes with a specific number of
> threads, that's a property of the core, no?
No, the max smt number comes from cap_ppc_smt, not from CPU type. PR KVM
may return something different (what does it return?) and TCG definitely
will not allow anything but 1. Up to the accelerator, not a CPU class.
--
Alexey
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, (continued)
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexey Kardashevskiy, 2014/01/09
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Mike Day, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexander Graf, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexey Kardashevskiy, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexander Graf, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexey Kardashevskiy, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexander Graf, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Mike Day, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Alexander Graf, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Mike Day, 2014/01/10
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core,
Alexey Kardashevskiy <=
- Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Mike Day, 2014/01/10
Re: [Qemu-devel] [RFC PATCH v2] PPC: smp: autodetect numbers of threads per core, Scott Wood, 2014/01/09