Ryzen issues on FreeBSD ?

[Don Lewis]

On 23 Jan, Pete French wrote:
> On 22/01/2018 18:25, Don Lewis wrote:
>> On 22 Jan, Pete French wrote:
>>>
>>>
>>> On 21/01/2018 19:05, Peter Moody wrote:
>>>> hm, so i've got nearly 3 days of uptime with smt disabled.
>>>> unfortunately this means that my otherwise '12' cores is actually only
>>>> '6'. I'm also getting occasional segfaults compiling go programs.
>>>
>>> Isn't go known to have issues on BSD anyway though ? I have seen
>>> complaints of random crashes running go under BSD systems - and
>>> preseumably the go compiler itself is written in go, so those issues
>>> might surface when compiling.
>> 
>> Not that I'm aware of.  I'm not a heavy go user on FreeBSD, but I don't
>> recall any unexpected go crashes and I haven't seen  problems building
>> go on my older AMD machines.
> 
> 
>  From the go 1.9 release notes:
> 
> "Known Issues
> There are some instabilities on FreeBSD that are known but not 
> understood. These can lead to program crashes in rare cases. See issue 
> 15658. Any help in solving this FreeBSD-specific issue would be 
> appreciated."
> 
> ( link is to https://github.com/golang/go/issues/15658 )
> 
> Having said that, we use it internally and have not seen any issues with 
> it ourselves. Just I am wary of the release notes, and that issue report.

Interesting ...

I've only seen problems on my Ryzen machine, which has >= 2x the number
of cores as any of my other machines.  All are AMD CPUs.