cvs commit: src/sys/dev/acpica acpi_cpu.c

[Nate Lawson]

Alan Cox wrote:
> 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?

I would like to see acpidump -t output and sysctl hw.acpi.  Please be 
sure you can regain performance by doing "sysctl hw.acpi.cpu.cx_lowest=C2".

-Nate