Date: Mon, 12 Jul 2010 08:40:36 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Markus Gebert <markus.gebert@hostpoint.ch> Cc: freebsd-stable <freebsd-stable@freebsd.org>, John Baldwin <jhb@freebsd.org> Subject: Re: 8.1-RC2 - PCI fatal error or MCE triggered by USB/ehci on Sun X4100M2? Message-ID: <20100712154036.GA13481@icarus.home.lan> In-Reply-To: <4615FFAA-F78B-475E-B40B-CC33791F1D23@hostpoint.ch> References: <6B57591F-9FA2-45EB-825F-1DB025C0635D@hostpoint.ch> <201007120851.35529.jhb@freebsd.org> <0CF6CF2B-907C-42EF-B57E-DF50F0564455@hostpoint.ch> <201007121106.59454.jhb@freebsd.org> <4615FFAA-F78B-475E-B40B-CC33791F1D23@hostpoint.ch>
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On Mon, Jul 12, 2010 at 05:23:23PM +0200, Markus Gebert wrote: > > On 12.07.2010, at 17:06, John Baldwin wrote: > > > Are you using Cx states other than C1 for the CPUs at all? > > Not sure how to find out, but I did not change anything in the BIOS settings (if even possible) or through sysctl regarding cpu idle modes. Anyway, here's what I found: > > # sysctl machdep.idle machdep.idle_available > machdep.idle: amdc1e > machdep.idle_available: spin, amdc1e, hlt, acpi, > > Not sure if "amdc1e" qualifies for something "other than C1". I tried "hlt" once, which didn't make a difference IIRC. And if that's not what you needed, here's more: > > # sysctl dev.cpu > [...] > dev.cpu.0.freq_levels: 2786/95000 2587/81800 2388/69811 2189/58977 1990/49240 1791/44316 995/22525 > dev.cpu.0.cx_supported: C1/0 > dev.cpu.0.cx_lowest: C1 > [...] cx_supported indicates your CPU only supports C1 and not lower power-saving states (C2/C3/C4, etc.). Non-C1 states can sometimes do "interesting" things when it comes to interrupt handling. I believe your system may support the C1E state (given what machdep.idle_available shows), but that's often controlled by the system BIOS (on both Intel and AMD processors, but I'm trying to focus on AMD here). C1E, as far as I know, is the same as C1 state except can save a little bit more power. I believe neither C1 nor C1E do anything with interrupts, instead just halting the core when idle/not in use. HLT mode, at least on multi-core AMD CPUs, equates to C1E. Shot in the dark: you're not running powerd(8) on this system are you? -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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