linux-kernel - Re: [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ

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Date:   Mon, 19 Dec 2016 15:30:17 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Denis Plotnikov <dplotnikov@...tuozzo.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     rkrcmar@...hat.com, rkagan@...tuozzo.com
Subject: Re: [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT



On 19/12/2016 14:05, Denis Plotnikov wrote:
>>
> This new patch-set does avoid unnecessary interrupt re-injections -
> checked.
> 
> The test (MS Windows, sending messages between multiple windows using
> windows-specific interface),
> which showed performance growth with "[PATCH v2] KVM: x86: avoid
> redundant REQ_EVENT" showed pretty much the same performance level with
> this new patch-set.
> The test score difference (+2.4% to [PATCH v2]) is within the tolerance
> range(5%).
> 
> The test score on mainstream v4.9 kernel CPU Intel i5-2400, guest
> Windows Server 2012 2VCPU, 2GB:
> 
> without patch: 31510 (+/- 4%)
>    with patch: 36270 (+/- 5%)
> 
> difference = (36270-31510)/31510 * 100 = +15% -- looks good!

Awesome!  I hope it also qualifies as less ugly. :)

Paolo