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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fad8ceed-8b98-8fc4-5b6a-63bbca4059a8@redhat.com>
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