linux-kernel - Re: [PATCH] KVM: LAPIC: Periodically revaluate appropriate lapic_timer_advance

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Date:   Fri, 9 Aug 2019 12:24:08 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH] KVM: LAPIC: Periodically revaluate appropriate
 lapic_timer_advance_ns

On 09/08/19 07:45, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> Even if for realtime CPUs, cache line bounces, frequency scaling, presence 
> of higher-priority RT tasks, etc can cause different response. These 
> interferences should be considered and periodically revaluate whether 
> or not the lapic_timer_advance_ns value is the best, do nothing if it is,
> otherwise recaluate again. 

How much fluctuation do you observe between different runs?

Paolo