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Date: Tue, 17 Jan 2012 09:06:06 -0500
From: Bruce Ashfield <bruce.ashfield@windriver.com>
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To: "Zhai, Edwin" <edwin.zhai@intel.com>
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Cc: yocto@yoctoproject.org
Subject: Re: Request to enable SMP and virtio for qemux86/x86-64
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On 12-01-12 08:14 AM, Zhai, Edwin wrote:
> Bruce,
> Thanks for your efforts!

FYI: I haven't forgotten about this, I'm just reworking a few
things with the 3.2 kernel tree, and will include this as part
of that effort. It will all be available soon.

Bruce

>
> Edwin
>
> On 2012/1/11 20:43, Bruce Ashfield wrote:
>> On 12-01-11 02:01 AM, Zhai, Edwin wrote:
>>> Bruce,
>>> Can we enable SMP and virtio by default for qemux86/x86-64? This can
>>> achieve
>>> huge perf boost for workload inside qemu. E.g. we enabled self-hosted
>>> image,
>>> where we build yocto inside qemu.
>>>
>>> Attached patch showes the kernel config option.
>>>
>>> Is it reasonable?
>>
>> It should be. I just need to look at the fallback modes, and how this
>> impacts different host systems. That being said, I've run with similar
>> configs in the past (depending on the workload) with no issues.
>>
>> qemux8-64 is already SMP, so it would just need the addition of virtio
>> devices, which just means we'd look at this as any BSP/target config
>> update.
>>
>> But with graceful degradation (i.e maxcpus with SMP set) and agreement
>> that we'd like to simulate SMP by default, then we can make the change
>> and I'll merge it into the base config for the target and pull it into
>> the kernel tree.
>>
>> Cheers,
>>
>> Bruce
>>
>>
>>
>>
>>>
>>> Thanks,
>>> Edwin
>>>
>>
>