Date: Tue, 08 Dec 2015 10:41:05 -0800 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Rick Macklem <rmacklem@uoguelph.ca>, Adrian Chadd <adrian.chadd@gmail.com>, Alexander Kabaev <kabaev@gmail.com> Subject: Re: slow screen updates on laptop console (i386) Message-ID: <1558819.MnyjzOdus5@ralph.baldwin.cx> In-Reply-To: <387840531.122544462.1449529268528.JavaMail.zimbra@uoguelph.ca> References: <900422043.121631608.1449496955386.JavaMail.zimbra@uoguelph.ca> <CAJ-Vmom3xd7B%2B3hcFvP-yzGSDv1m3E%2BdRj_EdL8s%2BVzKMHN2zQ@mail.gmail.com> <387840531.122544462.1449529268528.JavaMail.zimbra@uoguelph.ca>
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On Monday, December 07, 2015 06:01:08 PM Rick Macklem wrote: > Adrian Chadd wrote: > > Hi, > > > > ok. please file a bug for that. It may be something to do with the > > hardware and sleep states and skipping wakeups/interrupts or > > something. > > > > Please try using the default again (LAPIC?) and set > > kern.eventtimer.periodic=1. See if that fixes it. > > > Actually made it worse. Instead of being intermittently slow, it was > almost constantly slow. Try disabling C-states if they are enabled. If you have a BIOS option for C1E you might need to disable that as well. If this fixes it, then there isn't a really viable solution in software, and you might prefer to use the RTC to get the power savings from C-states. -- John Baldwin
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