On Thu, 2021-01-28 at 19:26 +0100, Dario Faggioli wrote:
> 
> [...]
>
> 2) Then there has been his one:
> 
>  
> https://lists.xenproject.org/archives/html/xen-devel/2020-10/msg01005.html
> 
> Here, the where reporter said that "[credit1] results is an
> observable
> delay, unusable performance; credit2 seems to be the only usable
> scheduler". This is the one that also Andrew mention, happening on
> Ryzen and with SMT disabled (as this is on QubesOS, IIRC).
> 
> Here, doing "dom0_max_vcpus=1 dom0_vcpus_pin" seemed to mitigate the
> problem but, of course, with obvious limitations. I don't have a
> Ryzen
> handy, but I have a Zen and a Zen2. 
>
And, what I meant here was "I have an EPYC and an EPYC2". Sorry.

Also, in my previous email, I forgot to properly trim the context above
my actual reply.

Sorry about that too.
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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<<This happens because _I_ choose it to happen!>> (Raistlin Majere)