This test demonstrates the performance cliff clients face when they
unwittingly use too many fenced surfaces in a looped upload.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
Note that pass/fail here is based on arbitrary value, and passing the test
is a wishlist item. Is it worthwhile pushing as is, or should distinguish
it a bit more?
---
tests/Makefile.sources | 1 +
tests/gem_fence_upload.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+)
create mode 100644 tests/gem_fence_upload.c
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index a8c0c96..459c7c9 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -86,6 +86,7 @@ TESTS_progs = \
gem_exec_blt \
gem_exec_lut_handle \
gem_fd_exhaustion \
+ gem_fence_upload \
gem_gtt_cpu_tlb \
gem_gtt_hog \
gem_gtt_speed \
diff --git a/tests/gem_fence_upload.c b/tests/gem_fence_upload.c
new file mode 100644
index 0000000..e306cdf
--- /dev/null
+++ b/tests/gem_fence_upload.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <pthread.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+
+#define OBJECT_SIZE (1024*1024) /* restricted to 1MiB alignment on i915 fences */
+
+static double elapsed(const struct timeval *start,
+ const struct timeval *end)
+{
+ return (end->tv_sec - start->tv_sec) + 1e-6*(end->tv_usec - start->tv_usec);
+}
+
+static void performance(void)
+{
+ int n, loop, count;
+ int fd, num_fences;
+ double linear[2], tiled[2];
+
+ fd = drm_open_any();
+
+ num_fences = gem_available_fences(fd);
+ assert (num_fences > 0);
+
+ for (count = 2; count < 4*num_fences; count *= 2) {
+ struct timeval start, end;
+ uint32_t handle[count];
+ void *ptr[count];
+
+ for (n = 0; n < count; n++) {
+ handle[n] = gem_create(fd, OBJECT_SIZE);
+ ptr[n] = gem_mmap(fd, handle[n], OBJECT_SIZE, PROT_READ | PROT_WRITE);
+ igt_assert(ptr[n]);
+ }
+
+ gettimeofday(&start, NULL);
+ for (loop = 0; loop < 1024; loop++) {
+ for (n = 0; n < count; n++)
+ memset(ptr[n], 0, OBJECT_SIZE);
+ }
+ gettimeofday(&end, NULL);
+
+ linear[count != 2] = count * loop / elapsed(&start, &end);
+ printf("Upload rate for %d linear surfaces: %7.3fMiB/s\n",
+ count, linear[count != 2]);
+
+ for (n = 0; n < count; n++)
+ gem_set_tiling(fd, handle[n], I915_TILING_X, 1024);
+
+ gettimeofday(&start, NULL);
+ for (loop = 0; loop < 1024; loop++) {
+ for (n = 0; n < count; n++)
+ memset(ptr[n], 0, OBJECT_SIZE);
+ }
+ gettimeofday(&end, NULL);
+
+ tiled[count != 2] = count * loop / elapsed(&start, &end);
+ printf("Upload rate for %d tiled surfaces: %7.3fMiB/s\n",
+ count, tiled[count != 2]);
+
+ for (n = 0; n < count; n++) {
+ munmap(ptr[n], OBJECT_SIZE);
+ gem_close(fd, handle[n]);
+ }
+
+ }
+
+ errno = 0;
+ igt_assert(linear[1] > 0.75 * linear[0]);
+ igt_assert(tiled[1] > 0.75 * tiled[0]);
+}
+
+igt_main
+{
+ igt_skip_on_simulation();
+
+ igt_subtest("performance")
+ performance();
+
+ igt_exit();
+}
--
1.9.rc1
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