<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body bgcolor="white" lang="EN-US" link="blue" vlink="purple"> <div class="WordSection1"> <p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Wingdings"><span style="mso-list:Ignore">Ø<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]>But we still have to support cases where we have 1GB stolen VRAM, and wasting those 1GB would suck a bit.<br> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#2F5496">Not really, since we only move display buffer here.<o:p></o:p></span></p> <div> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#2F5496"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#2F5496">Regards,<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#2F5496">Samuel Li<o:p></o:p></span></p> </div> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#2F5496"><o:p> </o:p></span></p> <div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"> <div> <div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"> <p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> Koenig, Christian <br> <b>Sent:</b> Wednesday, March 21, 2018 10:07 AM<br> <b>To:</b> Marek Olšák <maraeo@gmail.com><br> <b>Cc:</b> Deucher, Alexander <Alexander.Deucher@amd.com>; Alex Deucher <alexdeucher@gmail.com>; Michel Dänzer <michel@daenzer.net>; amd-gfx list <amd-gfx@lists.freedesktop.org>; Li, Samuel <Samuel.Li@amd.com><br> <b>Subject:</b> Re: [PATCH 1/2] drm/amdgpu: Enable scatter gather display support<o:p></o:p></span></p> </div> </div> <p class="MsoNormal"><o:p> </o:p></p> <div> <p class="MsoNormal">Am 21.03.2018 um 14:57 schrieb Marek Olšák:<o:p></o:p></p> </div> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"> <div> <div> <div> <p class="MsoNormal">On Wed, Mar 21, 2018 at 4:13 AM, Christian König <<a href="mailto:ckoenig.leichtzumerken@gmail.com" target="_blank">ckoenig.leichtzumerken@gmail.com</a>> wrote:<o:p></o:p></p> <blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <div> <div> <p class="MsoNormal">Am 21.03.2018 um 06:08 schrieb Marek Olšák:<o:p></o:p></p> </div> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"> <div> <div> <div> <p class="MsoNormal">On Tue, Mar 20, 2018 at 4:16 PM, Christian König <<a href="mailto:christian.koenig@amd.com" target="_blank">christian.koenig@amd.com</a>> wrote:<o:p></o:p></p> <blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <div> <div> <p class="MsoNormal">That's what I meant with use up the otherwise unused VRAM. I don't see any disadvantage of always setting GTT as second domain on APUs.<br> <br> My assumption was that we dropped this in userspace for displayable surfaces, but Marek proved that wrong.<br> <br> So what we should do is actually to add GTT as fallback to all BOs on APUs in Mesa and only make sure that the kernel is capable of handling GTT with optimal performance (e.g. have user huge pages etc..).<o:p></o:p></p> </div> </div> </blockquote> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal" style="margin-bottom:12.0pt">VRAM|GTT is practically as good as GTT. VRAM with BO priorities and eviction throttling is the true "VRAM|GTT".<o:p></o:p></p> </div> <div> <p class="MsoNormal">I don't know how else to make use of VRAM intelligently.<o:p></o:p></p> </div> </div> </div> </div> </blockquote> <p class="MsoNormal"><br> Well why not set VRAM|GTT as default on APUs? That should still save quite a bunch of moves even with throttling.<o:p></o:p></p> </div> </blockquote> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">I explained why: <span class="gmail-">VRAM|GTT is practically as good as GTT.</span><o:p></o:p></p> </div> <div> <p class="MsoNormal"> <o:p></o:p></p> </div> <blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <div> <p class="MsoNormal"><br> I mean there really shouldn't be any advantage to use VRAM any more except that we want to use it up as long as it is available.<o:p></o:p></p> </div> </blockquote> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">Why are you suggesting to use VRAM|GTT then? Let's just only use GTT on all APUs.<o:p></o:p></p> </div> </div> </div> </div> </blockquote> <p class="MsoNormal"><br> Then we don't use the memory stolen for VRAM.<br> <br> See we want to get to a point where we have any ~16MB of stolen VRAM on APUs and everything else in GTT.<br> <br> But we still have to support cases where we have 1GB stolen VRAM, and wasting those 1GB would suck a bit.<br> <br> Christian.<br> <br> <br> <o:p></o:p></p> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"> <div> <div> <div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">Marek<o:p></o:p></p> </div> </div> </div> </div> </blockquote> <p class="MsoNormal"><o:p> </o:p></p> </div> </div> </body> </html>