From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 23 Jan 2004 20:54:39 +0100 From: Vojtech Pavlik Subject: Re: keyboard and USB problems (Re: 2.6.2-rc1-mm2) Message-ID: <20040123195439.GA7878@ucw.cz> References: <20040123013740.58a6c1f9.akpm@osdl.org> <20040123160152.GA18073@ss1000.ms.mff.cuni.cz> <20040123161946.GA6934@ucw.cz> <1074886056.12447.36.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1074886056.12447.36.camel@localhost> Sender: owner-linux-mm@kvack.org Return-Path: To: john stultz Cc: Andrew Morton , lkml , linux-mm@kvack.org List-ID: On Fri, Jan 23, 2004 at 11:27:41AM -0800, john stultz wrote: > On Fri, 2004-01-23 at 08:19, Vojtech Pavlik wrote: > > On Fri, Jan 23, 2004 at 05:01:52PM +0100, Rudo Thomas wrote: > > > BogoMIPS is figured out to be 8.19 (this was already reported by another user), > > > > ... this the root cause of the following problems. > > > > > and i8042.c complaints with this: > > > i8042.c: Can't write CTR while closing AUX. > > > > ... bogomips is used in udelay() and that's used for waiting. If > > bogomips is measured lower than real, the wait takes shorter and the > > hardware doesn't do what it should in that short time. > > Well, loops_per_jiffy is actually being measured correctly as we're > using the acpi pm timesource to time udelay(). However there is a loss > of resolution using the slower time source, so udelay(1) might take > longer then 1 us. Longer udelay shouldn't cause trouble. Shorter one definitely would. > If that is going to cause problems, then we'll need to pull out the > use-pmtmr-for-delay_pmtmr patch. I guess our only option is then to use > the TSC for delay_pmtrm() (as a loop based delay fails in other cases). > I'll write that up and send it your way, Andrew. I've seen the PM timer breaking the mouse operation rather badly in the past, the lost-sync check was triggering for many people when the PM timer was used. This implies time inacurracy in the range of 0.5 seconds. Could that happen somehow? -- Vojtech Pavlik SuSE Labs, SuSE CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org