Date: Tue, 23 Mar 2021 09:34:33 +0000 From: myfreeweb <greg@unrelenting.technology> To: freebsd-current@freebsd.org, Michael Gmelin <freebsd@grem.de>, monochrome <monochrome@twcny.rr.com> Subject: Re: freebsd 13 ryzen micro stutter Message-ID: <ED533759-D326-45D5-8AE2-51CB10763A1E@unrelenting.technology> In-Reply-To: <20210323101146.18c9a969@bsd64.grem.de> References: <d793c8b7-e0e2-e0d9-3ecd-923134d15bf3@twcny.rr.com> <20210323101146.18c9a969@bsd64.grem.de>
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On March 23, 2021 9:11:46 AM UTC, Michael Gmelin <freebsd@grem.de> wrote: > > >On Mon, 22 Mar 2021 23:50:52 -0400 >monochrome <monochrome@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. >Try running with powerd disabled. well, if you do that, don't forget to manually set the freq sysctl to the maximumhelp
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