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| author | Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> | 2010-02-10 21:35:31 +0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2010-02-22 21:10:14 +0300 |
| commit | d306ebc28649b89877a22158fe0076f06cc46f60 (patch) | |
| tree | 9a054d9a01889acca64bf018ed1e4778db0d5e19 /drivers/clocksource | |
| parent | 627fa177a1502ad24390d945851209ac022f3a36 (diff) | |
| download | linux-d306ebc28649b89877a22158fe0076f06cc46f60.tar.xz | |
ACPI: Be in TS_POLLING state during mwait based C-state entry
ACPI deep C-state entry had a long standing bug/missing feature, wherein we were sending
resched IPIs when an idle CPU is in mwait based deep C-state. Only mwait based C1 was using
the write to the monitored address to wake up mwait'ing CPU.
This patch changes the code to retain TS_POLLING bit if we are entering an mwait based
deep C-state.
The patch has been verified to reduce the number of resched IPIs in general and also
improves the performance/power on workloads with low system utilization (i.e., when mwait based
deep C-states are being used).
Fixes "netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f"
http://marc.info/?l=linux-kernel&m=126441481427331&w=4
Reported-by: Lin Ming <ming.m.lin@intel.com>
Tested-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/clocksource')
0 files changed, 0 insertions, 0 deletions