Date: Tue, 24 Jan 2023 12:04:48 -0800 From: Stavros Filargyropoulos <stav@stav.cc> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-questions@freebsd.org Subject: Re: Load 0.20 on a freshly installed idle system Message-ID: <CAGAKwch475=0O8AKfPdt%2BTf7uL1o=suCE9kS=cGaxvOthge4hw@mail.gmail.com> In-Reply-To: <9A7F4436-4888-42E2-93B9-7A8BA342877B@nimnet.asn.au> References: <CAGAKwcjmzz%2B6NMaK2YpjWZPB282RvrKV6zQ%2BSLHsDj3zqXwvGw@mail.gmail.com> <CAFbbPuhX%2BrJFLn8ALVNbCujf1tG3DufVWGSknPkJ%2BKdovFq1xQ@mail.gmail.com> <CAGAKwcgFWukBrB_6SZVAoC4YKyPVhVMGED4aB6Z4E1fwZAO6mg@mail.gmail.com> <CAFbbPuhyJDewvE_a6MQpiGrpUew7EtxZKwt_=RHODNUyCYNduw@mail.gmail.com> <CAGAKwcghHH5t1_dtWPkOCwxPvDra%2BmgNFTQsG65i1_7pzTDkug@mail.gmail.com> <CAFbbPujMDQgo=zvSc5orcT=v3ftrVPXDjZE-D%2BUxt3%2BdOjFmUA@mail.gmail.com> <CAGAKwcid8j3C28wiypO87X9HT9Wq8cfTNHWnOQvcQgAcWrFuLw@mail.gmail.com> <CAGAKwcgZz8gujtd8gPBoC5nKxE00q1Pau6%2BiOUjxBR-UMMNpKw@mail.gmail.com> <1889CB4C-4B11-4178-8446-97DA9E5EC35A@nimnet.asn.au> <CAGAKwchY_pU5PP0XX2UsUOSf027ZfbdMgd3wXzaKpu=Fi=J2Uw@mail.gmail.com> <9A7F4436-4888-42E2-93B9-7A8BA342877B@nimnet.asn.au>
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On Tue, Jan 24, 2023 at 11:10 AM Ian Smith <smithi@nimnet.asn.au> wrote: > > Yes; I updated to 12.4-R yesterday (due anyway) assuming 'months ago' sho= uld have been before 12.4 left 12-STABLE, but see no change. > > I emailed gbe@ as well, in case he's buried in PR mail.\ Yeah, I saw your reply. Thanks a lot Ian! > > I put quite some time exploring this back in 2016, as did Jeremy Chadwick= , so I'd pretty much given up since 0.1 or 0.2 nowadays is better than 0.6 = then, and noone could explain how my magic fix for 9.2-STABLE worked, let a= lone me. > > I now understand a bit better what Alexander Motin (mav@) was explaining = in posts #9, #27 and now #46 and #48, and accept the trade-off between idle= accuracy and performance (particularly minimal power consumption on laptop= s) that the current scheme provides. > On one hand I understand his point as well. On the other hand, well I already said it, it's bugging me that it's not right :D On a side note, I've been trying to see it for myself using KTR, but having trouble converting the timestamp to actual time. I understand it's what RDTSC is giving us, but was wondering if there is a formula to convert it to secs?. Do you have any tips? Tried dividing by `machdep.tsc_freq: 2419204467` but the number I get doesn't make much sense. I assume with modern cpus changing the frequency all the time this is even more challenging? Thanks, Stavros
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