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igt/gem_read_read_speed: Tweak to show comparison against write-write

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Since we hold an exclusive write lock we expect 2 writes to happen
serially, but we expect 2 reads to happen in parallel. Expand the testing
to demonstrate this effect (i.e. we expect read-read to be roughly 2x
faster than write-write for small copies on big core.)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-12-13 12:46:47 +00:00
parent 866a6f2c41
commit 14f70a861b
1 changed files with 24 additions and 6 deletions
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30
tests/gem_read_read_speed.c
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@ -154,7 +154,8 @@ static drm_intel_bo *create_bo(drm_intel_bufmgr *bufmgr,
&tiling_mode, &pitch, 0); &tiling_mode, &pitch, 0);
} }
static void run(drm_intel_bufmgr *bufmgr, int _width, int _height) static void run(drm_intel_bufmgr *bufmgr, int _width, int _height,
bool write_bcs, bool write_rcs)
{ {
drm_intel_bo *src = NULL, *bcs = NULL, *rcs = NULL; drm_intel_bo *src = NULL, *bcs = NULL, *rcs = NULL;
drm_intel_bo *bcs_batch, *rcs_batch; drm_intel_bo *bcs_batch, *rcs_batch;
@ -170,8 +171,16 @@ static void run(drm_intel_bufmgr *bufmgr, int _width, int _height)
set_bo(src, 0xdeadbeef); set_bo(src, 0xdeadbeef);
rcs_batch = rcs_copy_bo(rcs, src); if (write_bcs) {
bcs_batch = bcs_copy_bo(bcs, src); bcs_batch = bcs_copy_bo(src, bcs);
} else {
bcs_batch = bcs_copy_bo(bcs, src);
}
if (write_rcs) {
rcs_batch = rcs_copy_bo(src, rcs);
} else {
rcs_batch = rcs_copy_bo(rcs, src);
}
drm_intel_bo_unreference(rcs); drm_intel_bo_unreference(rcs);
drm_intel_bo_unreference(bcs); drm_intel_bo_unreference(bcs);
@ -185,7 +194,9 @@ static void run(drm_intel_bufmgr *bufmgr, int _width, int _height)
drm_intel_gem_bo_start_gtt_access(src, true); drm_intel_gem_bo_start_gtt_access(src, true);
clock_gettime(CLOCK_MONOTONIC, &end); clock_gettime(CLOCK_MONOTONIC, &end);
igt_info("Time to read-read %dx%d [%dk]: %7.3fµs\n", igt_info("Time to %s-%s %dx%d [%dk]: %7.3fµs\n",
write_bcs ? "write" : "read",
write_rcs ? "write" : "read",
width, height, 4*width*height/1024, width, height, 4*width*height/1024,
elapsed(&start, &end, loops)); elapsed(&start, &end, loops));
@ -222,7 +233,14 @@ igt_main
igt_info("Semaphores: %d\n", semaphores_enabled(fd)); igt_info("Semaphores: %d\n", semaphores_enabled(fd));
} }
for (i = 0; sizes[i] != 0; i++) for (i = 0; sizes[i] != 0; i++) {
igt_subtest_f("read-read-%dx%d", sizes[i], sizes[i]) igt_subtest_f("read-read-%dx%d", sizes[i], sizes[i])
run(bufmgr, sizes[i], sizes[i]); run(bufmgr, sizes[i], sizes[i], false, false);
igt_subtest_f("read-write-%dx%d", sizes[i], sizes[i])
run(bufmgr, sizes[i], sizes[i], false, true);
igt_subtest_f("write-read-%dx%d", sizes[i], sizes[i])
run(bufmgr, sizes[i], sizes[i], true, false);
igt_subtest_f("write-write-%dx%d", sizes[i], sizes[i])
run(bufmgr, sizes[i], sizes[i], true, true);
}
} }