Date: Thu, 2 Mar 2006 06:13:33 +0000 From: "Ben Kaduk" <minimarmot@gmail.com> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: Mike Jakubik <mikej@rogers.com>, freebsd-current@freebsd.org Subject: Re: Still seeing "calcru: runtime went backwards" messages Message-ID: <47d0403c0603012213o32b6d6d0m6ab4207de9134577@mail.gmail.com> In-Reply-To: <15841.1141279248@critter.freebsd.dk> References: <200603011724.08214.jhb@freebsd.org> <15841.1141279248@critter.freebsd.dk>
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On 3/2/06, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > In message <200603011724.08214.jhb@freebsd.org>, John Baldwin writes: > > >Maybe we could make the dynamic flag for the tsc controllable via tunabl= e? > > Ideally ACPI would tell us the max TSC frequency and the TSC wouldn't nee= d > to be marked variable. Havn't had time to look at this yet though. > > >If I have a server machine without any fancy pentium-m cpufreq type stuf= f, > >then I would rather just use the tsc frequency snapshot taken at boot an= d > >just stick with that as the static frequency then have a bunch of warnin= gs > >on the console if the max freq changes sometime later. > > Right, I would actually prefer to try to make the calibration more precis= e > first, rather than add yet another knob for roots to remember to tweak. > > >Also, note that > >I am still getting a bunch of the backwards messages on my DS20 Alpha wh= ich > >is _not_ using the TSC. :) > > That's interesting... Alpha should be using the timecounter and that > is not marked "variable". > > My alpha hasn't been able to boot in a long time now :-( > > > (I should probably fix Alpha to use its own > >version of the TSC at some point, but for now I want to get it to stop > >spitting out the warnings when using the timecounters as that shouldn't > >be causing any warnings). > > I'd be tempted to just supress the warning if the negative delta is less > than 3usec (for some value of 3). Could not one put in a counter variable and only print the message every 50 times it happens (for some value of 50)? Ben Kaduk
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