Date: Wed, 31 Mar 2021 02:35:25 -0700 From: Alastair Hogge <agh@riseup.net> To: Hans Petter Selasky <hps@selasky.org> Cc: Santiago Martinez <sm@codenetworks.net>, freebsd-current@freebsd.org Subject: Re: freebsd 13 ryzen micro stutter Message-ID: <ec0b7ced3143c68a4a0b1bff6dd7e4ac@riseup.net> In-Reply-To: <2a4dad60-f1b8-8d48-337a-d23893a84f04@selasky.org> References: <d793c8b7-e0e2-e0d9-3ecd-923134d15bf3@twcny.rr.com> <20210323101146.18c9a969@bsd64.grem.de> <ED533759-D326-45D5-8AE2-51CB10763A1E@unrelenting.technology> <677da81d7af9781be6b46c7cba4efd05@riseup.net> <54768f44-c110-d58a-1e7b-61843cde754e@codenetworks.net> <9638abfe-fd9e-6855-b3c7-ee796d1c5ce5@codenetworks.net> <2a4dad60-f1b8-8d48-337a-d23893a84f04@selasky.org>
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On 2021-03-28 16:09, Hans Petter Selasky wrote: > On 3/27/21 11:54 AM, Santiago Martinez wrote: >> Hi, i have the same output as @Nils B. If i run with steal =2 and dtrace the micro stutter doesn't happen but as soon as i stop the dtrace script it the stutters come back again. >> > > Here is a patch which you can try. Not sure if it helps. > https://reviews.freebsd.org/D29467 Thanks Hans, this reduces jitter somewhat, but it still noticeable in Quake2. I left kern.sched.steal_thresh at 1. To good health, Alastair.
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