KVM: X86: Lower the default timer frequency limit to 200us
authorWanpeng Li <wanpengli@tencent.com>
Sat, 5 May 2018 11:02:32 +0000 (04:02 -0700)
committerPaolo Bonzini <pbonzini@redhat.com>
Tue, 15 May 2018 09:56:21 +0000 (11:56 +0200)
commit4c27625b7a67eb9006963ed2bcf8e53b259b43af
tree232f21838dfcd43a6ee929f9c456816c7e20d19b
parent64f7a11586ab9262f00b8b6eceef6d8154921bd8
KVM: X86: Lower the default timer frequency limit to 200us

Anthoine reported:
 The period used by Windows change over time but it can be 1
 milliseconds or less. I saw the limit_periodic_timer_frequency
 print so 500 microseconds is sometimes reached.

As suggested by Paolo, lower the default timer frequency limit to a
smaller interval of 200 us (5000 Hz) to leave some headroom. This
is required due to Windows 10 changing the scheduler tick limit
from 1024 Hz to 2048 Hz.

Reported-by: Anthoine Bourgeois <anthoine.bourgeois@blade-group.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Anthoine Bourgeois <anthoine.bourgeois@blade-group.com>
Cc: Darren Kenny <darren.kenny@oracle.com>
Cc: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/x86.c