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From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Subject: [Intel-gfx] [PATCH] drm/i915/selftests: Skip unstable timing measurements
Date: Fri,  8 Jan 2021 13:28:35 +0000
Message-ID: <20210108132835.4564-1-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20210107221724.10036-1-chris@chris-wilson.co.uk>

If any of the perf tests run into 0 time, not only are we liable to
divide by zero, but the result would be highly questionable.
Nevertheless, let's not have a div-by-zero error.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
---
 drivers/gpu/drm/i915/selftests/intel_memory_region.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 75839db63bea..126d4891ff01 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -852,6 +852,9 @@ static int _perf_memcpy(struct intel_memory_region *src_mr,
 		}
 
 		sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+		if (t[0] <= 0) /* ignore the impossible to protect our sanity */
+			continue;
+
 		pr_info("%s src(%s, %s) -> dst(%s, %s) %14s %4llu KiB copy: %5lld MiB/s\n",
 			__func__,
 			src_mr->name,
-- 
2.20.1

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  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-07 22:17 [Intel-gfx] [PATCH 1/5] " Chris Wilson
2021-01-07 22:17 ` [Intel-gfx] [PATCH 2/5] drm/i915/gt: Restore ce->signal flush before releasing virtual engine Chris Wilson
2021-01-08 15:18   ` Andi Shyti
2021-01-08 15:24     ` Chris Wilson
2021-01-08 15:54       ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 3/5] drm/i915/gt: Only retire on the last breadcrumb if the last request Chris Wilson
2021-01-08 15:55   ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 4/5] drm/i915/gt: Only disable preemption on gen8 render engines Chris Wilson
2021-01-08 15:24   ` Andi Shyti
2021-01-07 22:17 ` [Intel-gfx] [PATCH 5/5] drm/i915/gt: Disable arbitration on no-preempt requests Chris Wilson
2021-01-08 15:27   ` Andi Shyti
2021-01-07 23:07 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/selftests: Skip unstable timing measurements Patchwork
2021-01-07 23:09 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-07 23:38 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2021-01-08  0:16 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/selftests: Skip unstable timing measurements (rev2) Patchwork
2021-01-08  0:18 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-08  0:45 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-01-08  2:59 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-01-08 12:26 ` [Intel-gfx] [PATCH 1/5] drm/i915/selftests: Skip unstable timing measurements Andi Shyti
2021-01-08 13:26   ` Chris Wilson
2021-01-08 13:51     ` Andi Shyti
2021-01-08 13:54       ` Chris Wilson
2021-01-08 15:04         ` Andi Shyti
2021-01-08 13:28 ` Chris Wilson [this message]
2021-01-08 15:14   ` [Intel-gfx] [PATCH] " Chris Wilson
2021-01-08 15:25     ` Andi Shyti
2021-01-08 18:14 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with drm/i915/selftests: Skip unstable timing measurements (rev4) Patchwork
2021-01-08 18:16 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-01-08 18:45 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2021-01-06 21:18 [Intel-gfx] [PATCH] drm/i915/selftests: Skip unstable timing measurements Chris Wilson

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