freebsd 13 ryzen micro stutter

[Santiago Martinez]

Hi there, my pause are not that often ( with steal_thresh=2) , maybe is 
around 30 secs or so.

If i set the thresh to 1 or 0 they go away. Now im trying with =2 and 
schedgraph.d.

Santi


On 3/25/21 10:04 AM, Alastair Hogge wrote:
> On 2021-03-23 17:34, myfreeweb wrote:
>> On March 23, 2021 9:11:46 AM UTC, Michael Gmelin <freebsd at grem.de> wrote:
>>>
>>> On Mon, 22 Mar 2021 23:50:52 -0400
>>> monochrome <monochrome at twcny.rr.com> wrote:
>>>
>>>> After about 8 months of struggling to narrow this down I did another
>>>> search and saw this:
>>>>
>>>> https://www.reddit.com/r/freebsd/comments/lc8fwo/freebsd_13_vega_64_micro_stutter_in_x/
>>>>
>>>> I haven't seen this come up here so I thought I would bring it up.
>>>>
>>>> My story started sometime before around August last year when synergy
>>>> started getting really annoying with stuttering. Pretty sure it
>>>> wasn't like that when I first started tracking 13-current in around
>>>> May 2020 (I was on 12 with scfb for a long time before that with no
>>>> issues), but since then I have tried to eliminate as many variables
>>>> as possible. First I switched to barrier instead of synergy. Shortly
>>>> after that I realized it was happening all the time and not just a
>>>> network problem, I started using foobillard to verify during tests. I
>>>> tried different RAM combinations, different network cards, a variety
>>>> of RAM timings, stripping rc.conf etc, powerd settings, also scfb,
>>>> with no effect. It is observable with ping -f, a dot or two appears
>>>> every time it glitches. It seemed much better with RC2, but now with
>>>> RC3 it seems to be back with a vengeance, and since its my main
>>>> workstation and barrier/synergy server host for several machines, it
>>>> is unbearable to use. Both Win10 and devuan3 on the same machine are
>>>> smooth with no issues. Any feedback or info would be appreciated.
>>>>
>>>> Hardware:
>>>> ASRock B450M Pro4
>>>> Ryzen 2400G, no OC
>>>> 32M DDR4-2933
>>>> Onboard Vega GPU, drm-fbsd13-kmod
>>>> _______________________________________________
>>> Without knowing much about the issue at hand, just a few ideas:
>>>
>>> Sysctls I would look at:
>>> - raising *.cx_lowest
>>> - different kern.eventtimer.timer
>> None of these should be an issue, but:
>>
>> sysctl kern.sched.steal_thresh=1
>>
>> For some reason with the default value of 2, I'm seeing weird
>> stuttering in youtube videos, games, etc. on a 5950X system. 1 (or 0,
>> IIRC) works fine.
> I have noticed this too, firefox exhibits the issue frequently, however
> I have
> found it most noticeable in games/dhewm3[0] or Yamagi Quake 2[1]. There
> is a distinct pause every 3 or 4 seconds where the simulation advances
> significantly. Thanks for the kern.sched.steal_thresh pointer that has
> sorted
> the issue out for now.
>
> $ dmesg | egrep '(CPU:|avail memory)'
> CPU: AMD Ryzen 9 3950X 16-Core Processor             (3500.02-MHz
> K8-class CPU)
> avail memory = 66779394048 (63685 MB)
> With an AMD NAVI 8GiB GPU, the host should be able to play either game
> well enuf,
> Quake 2 came out in 1997 and Doom 3 2004. I am sure Quake 2 used to play
> without issues on my old AMD bulldozer.
>
>
> 0: https://www.freshports.org/games/dhewm3/
> 1: https://github.com/yquake2/yquake2
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