Re: [PATCH v4] drm/i915: Use Transparent Hugepages when IOMMU is enabled

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Hi,

For completeness sake, it might be worth mentioning specifically what (synthetic) test-cases regress with THP patch.

* Skylake GT4e:
  20-25% SynMark TexMem*
  (whereas all MemBW GPU tests either improve or are not affected)

* Broxton J4205:
  7% MemBW GPU texture
  2-3% SynMark TexMem*

* Tigerlake-H:
  7% MemBW GPU blend

I have no idea why on GEN9 texture accesses regress, but on GEN12 TGL it's render buffer blend that regresses.

Blend (read+write) regressing is especially odd, as neither render buffer read nor write regresses.

Maybe that is a GEN12 specific driver bug similar to Mesa/i965 bug from few years back in how its shaders access render buffer, that had caused SIMD32 accesses to regress memory BW bound test-cases perf a bit compared to SIMD16?

(Blend test is likely to run nowadays as SIMD32.)


	- Eero

On 7.9.2021 13.34, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Usage of Transparent Hugepages was disabled in 9987da4b5dcf
("drm/i915: Disable THP until we have a GPU read BW W/A"), but since it
appears majority of performance regressions reported with an enabled IOMMU
can be almost eliminated by turning them on, lets just do that.

To err on the side of safety we keep the current default in cases where
IOMMU is not active, and only when it is default to the "huge=within_size"
mode. Although there probably would be wins to enable them throughout,
more extensive testing across benchmarks and platforms would need to be
done.

With the patch and IOMMU enabled my local testing on a small Skylake part
shows OglVSTangent regression being reduced from ~14% (IOMMU on versus
IOMMU off) to ~2% (same comparison but with THP on).

More detailed testing done in the below referenced Gitlab issue by Eero:

Skylake GT4e:

Performance drops from enabling IOMMU:

     30-35% SynMark CSDof
     20-25% Unigine Heaven, MemBW GPU write, SynMark VSTangent
     ~20% GLB Egypt  (1/2 screen window)
     10-15% GLB T-Rex (1/2 screen window)
     8-10% GfxBench T-Rex, MemBW GPU blit
     7-8% SynMark DeferredAA + TerrainFly* + ZBuffer
     6-7% GfxBench Manhattan 3.0 + 3.1, SynMark TexMem128 & CSCloth
     5-6% GfxBench CarChase, Unigine Valley
     3-5% GfxBench Vulkan & GL AztecRuins + ALU2, MemBW GPU texture,
          SynMark Fill*, Deferred, TerrainPan*
     1-2% Most of the other tests

With the patch drops become:

     20-25% SynMark TexMem*
     15-20% GLB Egypt (1/2 screen window)
     10-15% GLB T-Rex (1/2 screen window)
     4-7% GfxBench T-Rex, GpuTest Triangle
     1-8% GfxBench ALU2 (offscreen 1%, onscreen 8%)
     3% GfxBench Manhattan 3.0, SynMark CSDof
     2-3% Unigine Heaven + Valley, MemBW GPU texture
     1-3 GfxBench Manhattan 3.1 + CarChase + Vulkan & GL AztecRuins

Broxton:

Performance drops from IOMMU, without patch:

     30% MemBW GPU write
     25% SynMark ZBuffer + Fill*
     20% MemBW GPU blit
     15% MemBW GPU blend, GpuTest Triangle
     10-15% MemBW GPU texture
     10% GLB Egypt, Unigine Heaven (had hangs), SynMark TerrainFly*
     7-9% GLB T-Rex, GfxBench Manhattan 3.0 + T-Rex,
          SynMark Deferred* + TexMem*
     6-8% GfxBench CarChase, Unigine Valley,
          SynMark CSCloth + ShMapVsm + TerrainPan*
     5-6% GfxBench Manhattan 3.1 + GL AztecRuins,
          SynMark CSDof + TexFilterTri
     2-4% GfxBench ALU2, SynMark DrvRes + GSCloth + ShMapPcf + Batch[0-5] +
          TexFilterAniso, GpuTest GiMark + 32-bit Julia

And with patch:

     15-20% MemBW GPU texture
     10% SynMark TexMem*
     8-9% GLB Egypt (1/2 screen window)
     4-5% GLB T-Rex (1/2 screen window)
     3-6% GfxBench Manhattan 3.0, GpuTest FurMark,
          SynMark Deferred + TexFilterTri
     3-4% GfxBench Manhattan 3.1 + T-Rex, SynMark VSInstancing
     2-4% GpuTest Triangle, SynMark DeferredAA
     2-3% Unigine Heaven + Valley
     1-3% SynMark Terrain*
     1-2% GfxBench CarChase, SynMark TexFilterAniso + ZBuffer

Tigerlake-H:

     20-25% MemBW GPU texture
     15-20% GpuTest Triangle
     13-15% SynMark TerrainFly* + DeferredAA + HdrBloom
     8-10% GfxBench Manhattan 3.1, SynMark TerrainPan* + DrvRes
     6-7% GfxBench Manhattan 3.0, SynMark TexMem*
     4-8% GLB onscreen Fill + T-Rex + Egypt (more in onscreen than
          offscreen versions of T-Rex/Egypt)
     4-6% GfxBench CarChase + GLES AztecRuins + ALU2, GpuTest 32-bit Julia,
          SynMark CSDof + DrvState
     3-5% GfxBench T-Rex + Egypt, Unigine Heaven + Valley, GpuTest Plot3D
     1-7% Media tests
     2-3% MemBW GPU blit
     1-3% Most of the rest of 3D tests

With the patch:

     6-8% MemBW GPU blend => the only regression in these tests (compared
          to IOMMU without THP)
     4-6% SynMark DrvState (not impacted) + HdrBloom (improved)
     3-4% GLB T-Rex
     ~3% GLB Egypt, SynMark DrvRes
     1-3% GfxBench T-Rex + Egypt, SynMark TexFilterTri
     1-2% GfxBench CarChase + GLES AztecRuins, Unigine Valley,
         GpuTest Triangle
     ~1% GfxBench Manhattan 3.0/3.1, Unigine Heaven

Perf of several tests actually improved with IOMMU + THP, compared to no
IOMMU / no THP:

     10-15% SynMark Batch[0-3]
     5-10% MemBW GPU texture, SynMark ShMapVsm
     3-4% SynMark Fill* + Geom*
     2-3% SynMark TexMem512 + CSCloth
     1-2% SynMark TexMem128 + DeferredAA

v2:
  * Add Kconfig dependency to transparent hugepages and some help text.
  * Move to helper for easier handling of kernel build options.

v3:
  * Drop Kconfig. (Daniel)

v4:
  * Add some benchmark results to commit message.

References: b901bb89324a ("drm/i915/gemfs: enable THP")
References: 9987da4b5dcf ("drm/i915: Disable THP until we have a GPU read BW W/A")
References: https://gitlab.freedesktop.org/drm/intel/-/issues/430
Co-developed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Eero Tamminen <eero.t.tamminen@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> # v1
---
  drivers/gpu/drm/i915/gem/i915_gemfs.c | 22 +++++++++++++++++++---
  1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gemfs.c b/drivers/gpu/drm/i915/gem/i915_gemfs.c
index 5e6e8c91ab38..dbdbdc344d87 100644
--- a/drivers/gpu/drm/i915/gem/i915_gemfs.c
+++ b/drivers/gpu/drm/i915/gem/i915_gemfs.c
@@ -6,7 +6,6 @@
#include <linux/fs.h>
  #include <linux/mount.h>
-#include <linux/pagemap.h>
#include "i915_drv.h"
  #include "i915_gemfs.h"
@@ -15,6 +14,7 @@ int i915_gemfs_init(struct drm_i915_private *i915)
  {
  	struct file_system_type *type;
  	struct vfsmount *gemfs;
+	char *opts;
type = get_fs_type("tmpfs");
  	if (!type)
@@ -26,10 +26,26 @@ int i915_gemfs_init(struct drm_i915_private *i915)
  	 *
  	 * One example, although it is probably better with a per-file
  	 * control, is selecting huge page allocations ("huge=within_size").
-	 * Currently unused due to bandwidth issues (slow reads) on Broadwell+.
+	 * However, we only do so to offset the overhead of iommu lookups
+	 * due to bandwidth issues (slow reads) on Broadwell+.
  	 */
- gemfs = kern_mount(type);
+	opts = NULL;
+	if (intel_vtd_active()) {
+		if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
+			static char huge_opt[] = "huge=within_size"; /* r/w */
+
+			opts = huge_opt;
+			drm_info(&i915->drm,
+				 "Transparent Hugepage mode '%s'\n",
+				 opts);
+		} else {
+			drm_notice(&i915->drm,
+				   "Transparent Hugepage support is recommended for optimal performance when IOMMU is enabled!\n");
+		}
+	}
+
+	gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, opts);
  	if (IS_ERR(gemfs))
  		return PTR_ERR(gemfs);



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