Ryzen issues on FreeBSD ?
Don Lewis
truckman at FreeBSD.org
Mon Jan 22 21:07:44 UTC 2018
On 22 Jan, Mike Tancsa wrote:
> On 1/21/2018 3:24 PM, Don Lewis wrote:
>>>
>>> I have supplied a customer with a Ryzen5 and a 350MB motherboard.
>>> But he runs Windows 10, but I haven't heard him complain about anything
>>> like this.
>>> But I'll ask him specific.
>>
>> Only the BSDs were affected by the shared page issue. I think Linux
>> already had a guard page. I don't think Windows was affected by the
>> idle C-state issue. I suspect it is caused by software not doing the
>> right thing during C-state transitions, but the publicly available
>> documentation from AMD is pretty lacking. The random segfault issue is
>> primarily triggered by heavy parallel software build loads and how many
>> Windows users do that?
>
>
> Are all the AMD accomodations that DragonFly did in FreeBSD ?
>
> http://lists.dragonflybsd.org/pipermail/commits/2017-August/626190.html
We only lowered the top of user space by 4KB, which should be
sufficient, and we unmapped the boundary page. The signal trampoline
was already in a separate page than the stack.
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