Date: Wed, 15 Jun 2011 21:27:16 +0200 From: "Ian FREISLICH" <ianf@clue.co.za> To: freebsd-current@FreeBSD.org Cc: Jung-uk Kim <jkim@FreeBSD.org> Subject: Re: Time keeping Issues with the low-resolution TSC timecounter Message-ID: <E1QWvkC-0001QH-Cj@clue.co.za>
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> > The problem I noticed first is that it takes unusually long until a > > key press is repeated. With the default eventtimer (HPET) it seems > > to take about 4s, which can be slightly improved by switching to > > i8254. > > > > The "error beep" seems to take longer than usual, too, > > and the system "feels sluggish" in general. > > > > An effect that is easier to measure is that the system is unable > > to properly keep the time. Again the problem is less severe when > > using i8254 instead of HPET: > > [SNIP] > > First of all, please do not mix timecounter issues with eventtimer. > They are not directly related. > > Can you please show me verbose boot messages *without* your patch? > Does "sysctl kern.timecounter.hardware=HPET" help *without* touching > eventtimers? I have the same issue with my system (Atom N270). The effect that I see is about 29 wall clock seconds are recorded as 1 system second. I had do something similar to the OP to make my system useable since it doesn't seem possible to influence timecounter choice at boot time. Ian -- Ian Freislich
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