From: Dave Airlie <airlied@gmail.com>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] Mapping snooped user pages into the GTT
Date: Sat, 8 Jan 2011 05:37:18 +1000 [thread overview]
Message-ID: <AANLkTimK7e7xuF938U67NC8DewJHRA7hvYOFWiUOy1DT@mail.gmail.com> (raw)
In-Reply-To: <1294416456-5410-1-git-send-email-chris@chris-wilson.co.uk>
On Sat, Jan 8, 2011 at 2:07 AM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> I've been looking at how we can improve upload/download performance on our
> UMA gfx. One under-used aspect of the IGP is its ability to blit between
> snooped-and-unsnooped memory i.e. from normal ram into the GTT. Only the
> BLT has this ability, almost all other functions of the GPU most be from
> unsnooped memory. SNB introduces its own cache handling that we need to
> exploit further, however the BLT remains and is orders of magnitude faster
> for read back than an UC read by the CPU...
You might want to test this on a 945G era machine, I think I tried to
get this working back in the TTM days,
I got a lot of crashes and pain and suffering.
But I might have had bad ops happening occasionally or something.
Dave.
next prev parent reply other threads:[~2011-01-07 19:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-07 16:07 [PATCH] Mapping snooped user pages into the GTT Chris Wilson
2011-01-07 19:37 ` Dave Airlie [this message]
2011-01-12 7:40 ` april
2011-01-12 11:34 ` Chris Wilson
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