Date: Sun, 10 Oct 2004 23:11:09 -0700 From: Nate Lawson <nate@root.org> To: FreeBSD Current <freebsd-current@FreeBSD.org> Subject: [Fwd: cvs commit: src/sys/dev/acpica acpi_cpu.c] Message-ID: <416A23FD.9070001@root.org>
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Please test if this slows your system down. You can run your workload with:
debug.acpi.disabled="cpu"
... to see if there's any difference. On most laptops that support C3,
there is BM control and this code won't be used. This only affects
systems which indicate they have C3 (via P_LVL3_LAT being < 1000, see
acpidump -t) but don't have a PM2_CNT_BLK (== 0, also in acpidump -t).
-Nate
-------- Original Message --------
Subject: cvs commit: src/sys/dev/acpica acpi_cpu.c
Date: Mon, 11 Oct 2004 06:06:45 +0000 (GMT)
From: Nate Lawson <njl@FreeBSD.org>
To: njl@FreeBSD.ORG
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
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