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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77436#c55">Comment # 55</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77436">bug 77436</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>It reminds me of severe TLB miss:
Can you please try
diff --git a/src/sna/gen7_render.c b/src/sna/gen7_render.c
index ce137bd..b08dc5c 100644
--- a/src/sna/gen7_render.c
+++ b/src/sna/gen7_render.c
@@ -1295,6 +1295,11 @@ gen7_bind_bo(struct sna *sna,
return offset * sizeof(uint32_t);
}
+ if (bo->tiling == I915_TILING_NONE && bo->pitch >= 4096) {
+ ErrorF("slow %s access to linear bo with pitch %d (handle=%d,
size=%d), scanout? %d, io? %d\n",
+ is_dst ? "write" : "read", bo->pitch, bo->handle,
kgem_bo_size(bo), bo->scanout, bo->io);
+ }
+
offset = sna->kgem.surface -=
sizeof(struct gen7_surface_state) / sizeof(uint32_t);
ss = sna->kgem.batch + offset;
and see if that warns about anything.</pre>
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