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SubjectRe: [PATCH v3] KVM: X86: Lower the default timer frequency limit to 200us
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On 05/05/2018 13:02, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@tencent.com>
>
> 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>
> ---
> v2 -> v3:
> * update patch subject and description
> v1 -> v2:
> * update patch subject and description
>
> arch/x86/kvm/x86.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 51ecd38..dc47073 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -114,7 +114,7 @@ module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
> static bool __read_mostly report_ignored_msrs = true;
> module_param(report_ignored_msrs, bool, S_IRUGO | S_IWUSR);
>
> -unsigned int min_timer_period_us = 500;
> +unsigned int min_timer_period_us = 200;
> module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
>
> static bool __read_mostly kvmclock_periodic_sync = true;
>

Applied, thanks.

Paolo

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