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| author | Suraj Jitindar Singh | 2016-10-14 02:53:22 +0200 |
|---|---|---|
| committer | Paul Mackerras | 2016-11-28 01:48:47 +0100 |
| commit | f4944613ad1ab6760589d5791488be1236c07fcc (patch) | |
| tree | 24b650324edfb6925ce490a547bf2c3843cee8df /arch/powerpc/kvm | |
| parent | KVM: PPC: Book3S HV: Add check for module parameter halt_poll_ns (diff) | |
| download | kernel-qcow2-linux-f4944613ad1ab6760589d5791488be1236c07fcc.tar.gz kernel-qcow2-linux-f4944613ad1ab6760589d5791488be1236c07fcc.tar.xz kernel-qcow2-linux-f4944613ad1ab6760589d5791488be1236c07fcc.zip | |
KVM: PPC: Decrease the powerpc default halt poll max value
KVM_HALT_POLL_NS_DEFAULT is an arch specific constant which sets the
default value of the halt_poll_ns kvm module parameter which determines
the global maximum halt polling interval.
The current value for powerpc is 500000 (500us) which means that any
repetitive workload with a period of less than that can drive the cpu
usage to 100% where it may have been mostly idle without halt polling.
This presents the possibility of a large increase in power usage with
a comparatively small performance benefit.
Reduce the default to 10000 (10us) and a user can tune this themselves
to set their affinity for halt polling based on the trade off between power
and performance which they are willing to make.
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm')
0 files changed, 0 insertions, 0 deletions