[Mesa-dev] [PATCH 07/15] i965/blorp: Use 16 pixel dispatch on Gen7 when there is a WM program.
stereotype441 at gmail.com
Wed May 23 12:12:29 PDT 2012
On 23 May 2012 11:15, Chad Versace <chad.versace at linux.intel.com> wrote:
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> On 05/23/2012 10:22 AM, Kenneth Graunke wrote:
> > On 05/23/2012 07:45 AM, Paul Berry wrote:
> >> On 22 May 2012 13:02, Eric Anholt <eric at anholt.net
> >> <mailto:eric at anholt.net>> wrote:
> >> On Fri, 11 May 2012 11:03:50 -0700, Paul Berry
> >> <stereotype441 at gmail.com <mailto:stereotype441 at gmail.com>> wrote:
> >> > When executing a blorp operation on Gen7 that does not need a WM
> >> > program (i.e. a HiZ operation), we use 32-pixel dispatch mode
> >> > it's faster. However, when executing a blorp operation that does
> >> need
> >> > a WM program, we need to use 16-pixel dispatch, because blorp WM
> >> > programs are compiled assuming 16-pixel dispatch.
> >> I didn't think dispatch mode means anything unless you're actually
> >> dispatching a thread (though I could see how having no dispatch
> mode set
> >> might anger things). Basically, I'm thinking just always set 16,
> >> there is some efficiency reason I don't know of.
> >> I don't honestly know. Chad, I inherited the 32-pixel dispatch from
> >> your HiZ code, and assumed you did it on purpose because it was faster.
> >> But I didn't actually do any tests. Do you have any thoughts about
> > I recall Chad saying that not setting thread dispatch broke horribly, so
> since he had enable thread dispatch, he picked the widest mode.
> What Ken said.
Thanks, Chad. I'll send out a v2 patch that just uses 16-wide dispatch
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