Date: Tue, 18 Nov 2003 22:37:21 +0100 (CET) From: Lukas Ertl <l.ertl@univie.ac.at> To: Nate Lawson <nate@root.org> Cc: current@freebsd.org Subject: Re: Updated acpi_cpu patch Message-ID: <20031118223352.W634@korben.in.tern> In-Reply-To: <20031118131708.C64933@root.org> References: <20031118094821.T64353@root.org> <20031118221008.U621@korben.in.tern> <20031118131708.C64933@root.org>
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On Tue, 18 Nov 2003, Nate Lawson wrote: > On Tue, 18 Nov 2003, Lukas Ertl wrote: > > > hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 > > hw.acpi.cpu.cx_lowest: 0 > > hw.acpi.cpu.cx_history: 86231/0 0/0 0/0 > > Try settings of cx_lowest of 1 and 2 (and 3 when the last C3 state is > available). I'm interested in any benchmark results, especially IO. I'm > hoping the scheduling of sleeps is good enough that you don't experience > much performance loss even with lower sleeps. I'm gonna try some "buildkernelstones" with the different settings. If you have some special benchmarks in mind I'd be happy to run them. > > Although it seems I have lost a C3 state (before, I had an additional > > C3/185). > > _CST can change dynamically at runtime. If you booted with the AC adapter > attached, your laptop may not offer all the sleep states. When you unplug > the AC adapter, we get a notify on _CST to re-evaluate it and look for new > states. However, that code is currently disabled due to complex locking > issues (i.e. what to do when a Cx state is being accessed but _CST is > being re-evaluated). _CST re-evaluation won't be enabled until after > 5.2R. However, you can reboot your laptop with the AC adapter detached > (or attached) to see what states are available. Ah, yes, that would explain it - I just booted on battery. > This excerpt from truckman@'s asl shows that 4 Cx states are only > available when the AC adapter is not attached. (The C*NA memory addresses > appear to be managed by the BIOS and not the AML but the PSR access is > clear). This part of the ASL looks the one here - let me guess, is it a ThinkPad? :-) regards, le -- Lukas Ertl eMail: l.ertl@univie.ac.at UNIX Systemadministrator Tel.: (+43 1) 4277-14073 Vienna University Computer Center Fax.: (+43 1) 4277-9140 University of Vienna http://mailbox.univie.ac.at/~le/
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