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_at_FreeBSD.org> To: njl_at_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.cReceived on Mon Oct 11 2004 - 04:11:10 UTC
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