From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 98E5A10E83B for ; Fri, 2 Sep 2022 13:00:56 +0000 (UTC) From: =?UTF-8?q?Zbigniew=20Kempczy=C5=84ski?= To: igt-dev@lists.freedesktop.org Date: Fri, 2 Sep 2022 15:00:07 +0200 Message-Id: <20220902130007.137214-13-zbigniew.kempczynski@intel.com> In-Reply-To: <20220902130007.137214-1-zbigniew.kempczynski@intel.com> References: <20220902130007.137214-1-zbigniew.kempczynski@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [igt-dev] [PATCH i-g-t v3 12/12] i915/gem_mmap_offset: Crudely measure read/write to different mmaps List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: From: Chris Wilson Compare the read/write performance of different mmap types to different memory regions. Signed-off-by: Chris Wilson Acked-by: Zbigniew Kempczyński --- tests/i915/gem_mmap_offset.c | 74 ++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/tests/i915/gem_mmap_offset.c b/tests/i915/gem_mmap_offset.c index 7fd0690962..f51d7e38f5 100644 --- a/tests/i915/gem_mmap_offset.c +++ b/tests/i915/gem_mmap_offset.c @@ -107,6 +107,73 @@ static void make_resident(int i915, uint32_t batch, uint32_t handle) gem_close(i915, obj[1].handle); } +static void perf(int i915, const struct gem_memory_region *r) +{ +#define MiB (1024 * 1024) + const unsigned int rep = 1024; + const uint64_t sz = 4096; + struct timespec tv; + uint32_t handle; + char buf[4096]; + + /* + * Time reading/writing through each mmap type into each + * memory region to have a rough estimate of the memory + * bandwidth exposed to userspace across each link. + * + * For example, we would expect that reading and writing to + * lmem would utilise the full PCIe bandwidth (>3.2GiB/s), + * and notably be symmetric, the same in both directions. + */ + + handle = gem_create_in_memory_region_list(i915, 4096, 0, &r->ci, 1); + make_resident(i915, 0, handle); + + for_each_mmap_offset_type(i915, t) { + double ns; + void *ptr; + + ptr = __mmap_offset(i915, handle, 0, sz, + PROT_READ | PROT_WRITE, + t->type); + if (!ptr) + continue; + + igt_nsec_elapsed(memset(&tv, 0, sizeof(tv))); + for (int i = 0; i < rep; i++) + memset(ptr, 0, sz); + ns = igt_nsec_elapsed(&tv); + igt_info("%s: Clear %12.2fMiB/s\n", + t->name, sz * rep * NSEC_PER_SEC / ns / MiB); + + igt_nsec_elapsed(memset(&tv, 0, sizeof(tv))); + for (int i = 0; i < rep; i++) + memcpy(ptr, buf, sz); + ns = igt_nsec_elapsed(&tv); + igt_info("%s: Write %12.2fMiB/s\n", + t->name, sz * rep * NSEC_PER_SEC / ns / MiB); + + igt_nsec_elapsed(memset(&tv, 0, sizeof(tv))); + for (int i = 0; i < rep; i++) + memcpy(buf, ptr, sz); + ns = igt_nsec_elapsed(&tv); + igt_info("%s: Read %12.2fMiB/s\n", + t->name, sz * rep * NSEC_PER_SEC / ns / MiB); + + igt_nsec_elapsed(memset(&tv, 0, sizeof(tv))); + for (int i = 0; i < rep; i++) + igt_memcpy_from_wc(buf, ptr, sz); + ns = igt_nsec_elapsed(&tv); + igt_info("%s: movntqda %12.2fMiB/s\n", + t->name, sz * rep * NSEC_PER_SEC / ns / MiB); + + munmap(ptr, sz); + } + + gem_close(i915, handle); +#undef MiB +} + static void bad_object(int i915) { uint32_t real_handle; @@ -836,6 +903,13 @@ igt_main } } + igt_subtest_with_dynamic("perf") { + for_each_memory_region(r, i915) { + igt_dynamic_f("%s", r->name) + perf(i915, r); + } + } + igt_subtest_f("blt-coherency") blt_coherency(i915); -- 2.34.1