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Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens

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On 03/10/2019 16:06, Salvatore Bonaccorso wrote:
> Control: tags -1 + moreinfo
>
> Hi
>
> On Thu, Oct 03, 2019 at 09:24:26AM +0100, Anton Ivanov wrote:
>> Package: src:linux
>> Version: 4.19.67-2+deb10u1
>> Severity: important
>>
>> Dear Maintainer,
>>
>> noht has no effect.
>>
>> I have been trying to chase down a weird hang which occurs only on 6
>> core/12 thread Ryzens (I cannot reproduce it on 4/8 or older CPUs).
>>
>> As a part of that I tried to disable ht. Well, it cannot be disabled
>> - the noht command line arg has no effect whatosever.
>>
>> As ht can be a security hole this may have security implications as
>> well.
> Do you mean 'nosmt'? (See kernel-parameters.txt).
>
> You can find further information as well in
> Documentation/admin-guide/hw-vuln/l1tf.rst.

I picked up noht from an older document somewhere and I cannot remember 
the actual source. It was definitely in the older version of RHEL 
guides, etc.

I can see that the parameter is nosmt now.

You can close the bug.

>
> Regards,
> Salvatore
>

-- 
Anton R. Ivanov
https://www.kot-begemot.co.uk/

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Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens Salvatore Bonaccorso <carnil@debian.org> - 2019-10-03 17:10 +0200
  Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-10-03 23:00 +0200

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