Date: Mon, 13 Jun 2011 14:56:34 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-current@FreeBSD.org Subject: Re: Time keeping Issues with the low-resolution TSC timecounter Message-ID: <201106131456.38038.jkim@FreeBSD.org> In-Reply-To: <20110613184410.4f6e2b81@fabiankeil.de> References: <20110613184410.4f6e2b81@fabiankeil.de>
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On Monday 13 June 2011 12:44 pm, Fabian Keil wrote: > I'm experiencing time-related issues that seem to be caused by > the low-resolution TSC timecounter (r222866). > > 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? Jung-uk Kim
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