From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v4 05/20] iommu/tegra: gart: Optimize mapping / unmapping
	performance
Date: Mon, 24 Sep 2018 12:07:22 +0200
Message-ID: <20180924100722.GG21032@ulmo>
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To: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jonathan Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
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On Mon, Sep 24, 2018 at 03:41:38AM +0300, Dmitry Osipenko wrote:
> Currently GART writes one page entry at a time. More optimal would be to
> aggregate the writes and flush BUS buffer in the end, this gives map/unmap
> 10-40% performance boost (depending on size of mapping) in comparison to
> flushing after each page entry update.
>=20
> Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/iommu/tegra-gart.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)

10-40% sounds really nice, great stuff:

Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

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