<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Mar 21, 2018 at 10:07 AM, Christian König <span dir="ltr"><<a href="mailto:christian.koenig@amd.com" target="_blank">christian.koenig@amd.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
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    <div class="m_1741296731872194054moz-cite-prefix">Am 21.03.2018 um 14:57 schrieb Marek
      Olšák:<br>
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          <div class="gmail_quote">On Wed, Mar 21, 2018 at 4:13 AM,
            Christian König <span dir="ltr"><<a href="mailto:ckoenig.leichtzumerken@gmail.com" target="_blank">ckoenig.leichtzumerken@gmail.<wbr>com</a>></span>
            wrote:<br>
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                  <div class="m_1741296731872194054m_-1982752714132975532moz-cite-prefix">Am
                    21.03.2018 um 06:08 schrieb Marek Olšák:<br>
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                        <div class="gmail_quote">On Tue, Mar 20, 2018 at
                          4:16 PM, Christian König <span dir="ltr"><<a href="mailto:christian.koenig@amd.com" target="_blank">christian.koenig@amd.com</a>></span>
                          wrote:<br>
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                              <div class="m_1741296731872194054m_-1982752714132975532m_4643584645760816653moz-cite-prefix">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..).<span class="m_1741296731872194054m_-1982752714132975532HOEnZb"><font color="#888888"><br>
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                          <div>VRAM|GTT is practically as good as GTT.
                            VRAM with BO priorities and eviction
                            throttling is the true "VRAM|GTT".<br>
                            <br>
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                          <div>I don't know how else to make use of VRAM
                            intelligently.</div>
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                </span> Well why not set VRAM|GTT as default on APUs?
                That should still save quite a bunch of moves even with
                throttling.<br>
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            <div>I explained why: <span class="m_1741296731872194054gmail-">VRAM|GTT is
                practically as good as GTT.</span><br>
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                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.<br>
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            <div>Why are you suggesting to use VRAM|GTT then? Let's just
              only use GTT on all APUs.</div>
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    <br></span>
    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></div></blockquote><div><br></div>BO priorities and BO move throttling should take care of optimal VRAM usage regardless of the VRAM size. We can adjust the throttling for small VRAM, but that's about all we can do.</div><div class="gmail_quote"><br></div><div class="gmail_quote">VRAM|GTT doesn't guarantee that VRAM will be used usefully. In fact, it doesn't guarantee anything about VRAM.<br></div><div class="gmail_quote"><br></div><div class="gmail_quote">Marek<br></div></div></div>