linux-kernel - Re: [PATCH v12 0/6] mm / virtio: Provide support for unused page reporting

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Date:   Mon, 28 Oct 2019 08:24:05 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     kvm list <kvm@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Yang Zhang <yang.zhang.wz@...il.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Pankaj Gupta <pagupta@...hat.com>,
        Rik van Riel <riel@...riel.com>, lcapitulino@...hat.com,
        Dave Hansen <dave.hansen@...el.com>,
        "Wang, Wei W" <wei.w.wang@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v12 0/6] mm / virtio: Provide support for unused page reporting

On Mon, Oct 28, 2019 at 7:34 AM Nitesh Narayan Lal <nitesh@...hat.com> wrote:
>
>
> On 10/22/19 6:27 PM, Alexander Duyck wrote:
>
>
> [...]
> > Below are the results from various benchmarks. I primarily focused on two
> > tests. The first is the will-it-scale/page_fault2 test, and the other is
> > a modified version of will-it-scale/page_fault1 that was enabled to use
> > THP. I did this as it allows for better visibility into different parts
> > of the memory subsystem. The guest is running on one node of a E5-2630 v3
> > CPU with 48G of RAM that I split up into two logical nodes in the guest
> > in order to test with NUMA as well.
> >
> > Test              page_fault1 (THP)     page_fault2
> > Baseline       1  1256106.33  +/-0.09%   482202.67  +/-0.46%
> >                 16  8864441.67  +/-0.09%  3734692.00  +/-1.23%
> >
> > Patches applied  1  1257096.00  +/-0.06%   477436.00  +/-0.16%
> >                 16  8864677.33  +/-0.06%  3800037.00  +/-0.19%
> >
> > Patches enabled        1  1258420.00  +/-0.04%   480080.00  +/-0.07%
> >  MADV disabled  16  8753840.00  +/-1.27%  3782764.00  +/-0.37%
> >
> > Patches enabled        1  1267916.33  +/-0.08%   472075.67  +/-0.39%
> >                 16  8287050.33  +/-0.67%  3774500.33  +/-0.11%
>
> If I am not mistaken then you are only observing the number of processes (and
> not the number of threads) launched over the 1st and the 16th vcpu  reported by
> will-it-scale?

You are correct these results are for the processes. I monitored them
for 1 - 16, but only included the results for 1 and 16 since those
seem to be the most relevant data points.