Date: Fri, 11 May 2007 03:49:39 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Garrett Cooper <youshi10@u.washington.edu> Cc: current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Experiences with 7.0-CURRENT and vmware. Message-ID: <20070511074939.GA39890@xor.obsecurity.org> In-Reply-To: <46441F1B.9000707@u.washington.edu> References: <20070510132153.A91312@fledge.watson.org> <20070510125445.GA5460@hub.freebsd.org> <20070510194144.GA66798@xor.obsecurity.org> <20070510204448.GB73840@hub.freebsd.org> <20070510211655.GA67752@xor.obsecurity.org> <4643DF94.8010508@u.washington.edu> <20070511031848.GA81680@xor.obsecurity.org> <4643E1E2.1060702@u.washington.edu> <20070511033014.GA82291@xor.obsecurity.org> <46441F1B.9000707@u.washington.edu>
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On Fri, May 11, 2007 at 12:45:31AM -0700, Garrett Cooper wrote: > Kris Kennaway wrote: > >On Thu, May 10, 2007 at 08:24:18PM -0700, Garrett Cooper wrote: > >>Kris Kennaway wrote: > >>>On Thu, May 10, 2007 at 08:14:28PM -0700, Garrett Cooper wrote: > >>>>Kris Kennaway wrote: > >>>>>On Thu, May 10, 2007 at 08:44:48PM +0000, Darren Reed wrote: > >>>>>>On Thu, May 10, 2007 at 03:41:44PM -0400, Kris Kennaway wrote: > >>>>>>>On Thu, May 10, 2007 at 12:54:45PM +0000, Darren Reed wrote: > >>>>>>... > >>>>>>>>In another reply it was "hint.apic.0.disabled=1". > >>>>>>>>My current loader.conf: > >>>>>>>> > >>>>>>>>vm.kmem_size=536870912 > >>>>>>>>vm.kmem_size_max=536870912 > >>>>>>>>unset acpi_load > >>>>>>>acpi_load="NO" to disable the module > >>>>>>> > >>>>>>>>hint.acpi.0.disabled=1 > >>>>>>>>hint.apci.0.disabled=1 > >>>>>>>dunno what apci does :) > >>>>>>> > >>>>>>>>hint.acpi.0.disabled="1" > >>>>>>>This is the one that should work. Can you confirm that you see it in > >>>>>>>the loader environment by doing 'show'? > >>>>>>ok. I modified my loader.conf to be: > >>>>>> > >>>>>>hint.acpi.0.disabled="1" > >>>>>>vm.kmem_size=536870912 > >>>>>>vm.kmem_size_max=536870912 > >>>>>>vfs.zfs.arc_max=402653184 > >>>>>> > >>>>>>and now ACPI is didsabled when the kernel boots :-) > >>>>>> > >>>>>>Is it possible for parsing errors of this file to generate errors? > >>>>>>And maybe pause for a few seconds so they can be read? > >>>>>I guess all things are possible with forth. > >>>>> > >>>>>>When I was modifying the loader.conf, I was looking for errors on > >>>>>>bootup but regarding getting acpi vs apci vs apic right, I never > >>>>>>saw any. My experience also tells me that errors seem to quietly > >>>>>>stop the rest of the file being parsed or...? > >>>>>> > >>>>>>>># sysctl kern.timecounter.hardware="ACPI-fast" > >>>>>>>>kern.timecounter.hardware: ACPI-safe > >>>>>>>>sysctl: kern.timecounter.hardware: Invalid argument > >>>>>>>kern.timecounter.choice > >>>>>>When I tried to set this with sysctl, I got told it was read-only. > >>>>>>The next step was to put it in loader.conf but now ACPI *is* disabled > >>>>>>:) > >>>>>Sorry, .hardware was the correct one. I don't know why you are unable > >>>>>to set it at runtime: > >>>>> > >>>>>xor# sysctl kern.timecounter.hardware=TSC > >>>>>kern.timecounter.hardware: ACPI-fast -> TSC > >>>>>xor# sysctl kern.timecounter.hardware=ACPI-fast > >>>>>kern.timecounter.hardware: TSC -> ACPI-fast > >>>>> > >>>>>Kris > >>>>I'm not sure why but it isn't settable with VMWare 1.03 server either. > >>>Maybe there are no other valid choices provided by vmware. > >>> > >>>>I gave the Intel ACPI one a shot though and I haven't seen any adverse > >>>>effects.. yet. It is true that the higher the number, the faster the > >>>>synchronization or the inverse? > >>>It's a "quality factor" that tries to estimate and rank the various > >>>properties of time counters (higher = better). > >>Basically sample rate? > > > >I think things like accuracy, query cost, stability. > > > >Kris > > > > Clock skew is a really big issue with VMWare and multiple cores. I'm > running amd64, and I've noticed that if I don't sync the clocks > regularly and run CPU intensive compiles, the clocks will skew a lot > (10~30 minutes if running buildworld over a 1.5 hour period), and when I > try and reboot the machine it fails to notify the running daemons that > they need to be killed. > > For now I'm switching my VM back to single core, but it should be noted > that this is a big issue and multicore vmware should not be tried (at > least with FreeBSD, as much as other OSes), because of the realtime > clock syncing problem. Didn't someone else address this upthread? Kris
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