From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 103697] [regression] shared memory size 64k -> 32k? Date: Mon, 13 Nov 2017 15:33:59 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1064800102==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 2871E6E65C for ; Mon, 13 Nov 2017 15:33:59 +0000 (UTC) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1064800102== Content-Type: multipart/alternative; boundary="15105872390.Cd47.4490"; charset="UTF-8" --15105872390.Cd47.4490 Date: Mon, 13 Nov 2017 15:33:59 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D103697 --- Comment #2 from O Heid --- I checked back with AMD and they say that there is hardware support for 64kB shared memory. This actually gets exposed in OpenCL and ROCm/HC. The 2016 AMD GCN3 manual wrongly states it is only 32kB, but the AMD Vega I= SA reference guide has the correct 64kB LDS size. So it seems the restriction is due to the mesa software stack, not due to hardware. Could you please raise the bar back to 64kB? I wouldn't ask if it wouldn't hit me with with a 2x performance penalty... --=20 You are receiving this mail because: You are the assignee for the bug.= --15105872390.Cd47.4490 Date: Mon, 13 Nov 2017 15:33:59 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated

Commen= t # 2 on bug 10369= 7 from O Heid 
I checked back with AMD and they say that there is hardware su=
pport for 64kB
shared memory. This actually gets exposed in OpenCL and ROCm/HC.
The 2016 AMD GCN3 manual wrongly states it is only 32kB, but the AMD Vega I=
SA
reference guide has the correct 64kB LDS size.
So it seems the restriction is due to the mesa software stack, not due to
hardware. Could you please raise the bar back to 64kB? I wouldn't ask if it
wouldn't hit me with with a 2x performance penalty...

You are receiving this mail because:
  • You are the assignee for the bug.
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