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igt/gem_exec_nop: Relax parallel assertion for short rings

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On bdw, the render ring becomes full and limits dispatch across all rings.
Adjust the expected latency to take this into account.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-03-28 16:26:01 +01:00
parent 870c774b86
commit 41a26b5152
1 changed files with 10 additions and 2 deletions
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12
tests/gem_exec_nop.c
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@ -126,7 +126,7 @@ static void all(int fd, uint32_t handle, int timeout)
unsigned nengine;
unsigned engine;
unsigned long count;
double time, max = 0, sum = 0;
double time, max = 0, min = HUGE_VAL, sum = 0;
const char *name;
nengine = 0;
@ -139,6 +139,8 @@ static void all(int fd, uint32_t handle, int timeout)
name = e__->name;
max = time;
}
if (time < min)
min = time;
sum += time;
engines[nengine++] = engine;
}
@ -179,7 +181,13 @@ static void all(int fd, uint32_t handle, int timeout)
time = elapsed(&start, &now) / count;
igt_info("All (%d engines): %'lu cycles, average %.3fus per cycle\n",
nengine, count, 1e6*time);
igt_assert(time < 2*sum/nengine); /* ensure parallel execution */
/* The rate limiting step is how fast the slowest engine can
* its queue of requests, if we wait upon a full ring all dispatch
* is frozen. So in general we cannot go faster than the slowest
* engine, but we should equally not go any slower.
*/
igt_assert(time < max + min); /* ensure parallel execution */
}
igt_main