linux-kernel - Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting

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Message-ID: <20190306133613-mutt-send-email-mst@kernel.org>
Date:   Wed, 6 Mar 2019 13:38:15 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, pbonzini@...hat.com, lcapitulino@...hat.com,
        pagupta@...hat.com, wei.w.wang@...el.com, yang.zhang.wz@...il.com,
        riel@...riel.com, david@...hat.com, dodgen@...gle.com,
        konrad.wilk@...cle.com, dhildenb@...hat.com, aarcange@...hat.com,
        alexander.duyck@...il.com
Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting

On Wed, Mar 06, 2019 at 01:30:14PM -0500, Nitesh Narayan Lal wrote:
> > Want to try testing Alex's patches for comparison?
> Somehow I am not in a favor of doing a hypercall on every page (with
> huge TLB order/MAX_ORDER -1) as I think it will be costly.
> I can try using Alex's host side logic instead of virtio.
> Let me know what you think?

I am just saying maybe your setup is misconfigured
that's why you see no speedup. If you try Alex's
patches and *don't* see speedup like he does, then
he might be able to help you figure out why.
OTOH if you do then *you* can try figuring out why
don't your patches help.

-- 
MST