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Date: Mon, 11 Oct 2004 15:22:37 -0500
From: Alan Cox <alc@cs.rice.edu>
To: Nate Lawson <njl@FreeBSD.org>
Message-ID: <20041011202237.GQ9689@cs.rice.edu>
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Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c
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On Mon, Oct 11, 2004 at 06:06:42AM +0000, Nate Lawson wrote:
> njl         2004-10-11 06:06:42 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/dev/acpica       acpi_cpu.c 
>   Log:
>   If bus mastering control is not available (PM2_BLK), don't just disable
>   C3.  Instead, flush caches before entering C3.  This may be slower but
>   provides good power savings.
>   
>   Revision  Changes    Path
>   1.44      +28 -17    src/sys/dev/acpica/acpi_cpu.c

This has pessimized the performance of my P4.  For example, the "buildworld"
time has increased by 30 seconds (out of ~30 minutes).

Is there any information about my machine that you would like to have?

Regards,
Alan