* [PATCH v6 1/2] Update AVX512 support for xbzrle_encode_buffer
2022-08-26 9:57 [PATCH v6 0/2] This patch updates AVX512 support for xbzrle ling xu
@ 2022-08-26 9:57 ` ling xu
2022-09-19 15:10 ` Xu, Ling1
` (2 more replies)
2022-08-26 9:57 ` [PATCH v6 2/2] Unit test code and benchmark code ling xu
1 sibling, 3 replies; 7+ messages in thread
From: ling xu @ 2022-08-26 9:57 UTC (permalink / raw)
To: qemu-devel; +Cc: quintela, dgilbert, ling xu, Zhou Zhao, Jun Jin
This commit updates code of avx512 support for xbzrle_encode_buffer
function to accelerate xbzrle encoding speed. Runtime check of avx512
support and benchmark for this feature are added. Compared with C
version of xbzrle_encode_buffer function, avx512 version can achieve
50%-70% performance improvement on benchmarking. In addition, if dirty
data is randomly located in 4K page, the avx512 version can achieve
almost 140% performance gain.
Signed-off-by: ling xu <ling1.xu@intel.com>
Co-authored-by: Zhou Zhao <zhou.zhao@intel.com>
Co-authored-by: Jun Jin <jun.i.jin@intel.com>
---
meson.build | 16 ++++++
meson_options.txt | 2 +
migration/ram.c | 34 +++++++++++--
migration/xbzrle.c | 124 +++++++++++++++++++++++++++++++++++++++++++++
migration/xbzrle.h | 4 ++
5 files changed, 177 insertions(+), 3 deletions(-)
diff --git a/meson.build b/meson.build
index 20fddbd707..5d4b82d7f3 100644
--- a/meson.build
+++ b/meson.build
@@ -2264,6 +2264,22 @@ config_host_data.set('CONFIG_AVX512F_OPT', get_option('avx512f') \
int main(int argc, char *argv[]) { return bar(argv[0]); }
'''), error_message: 'AVX512F not available').allowed())
+config_host_data.set('CONFIG_AVX512BW_OPT', get_option('avx512bw') \
+ .require(have_cpuid_h, error_message: 'cpuid.h not available, cannot enable AVX512BW') \
+ .require(cc.links('''
+ #pragma GCC push_options
+ #pragma GCC target("avx512bw")
+ #include <cpuid.h>
+ #include <immintrin.h>
+ static int bar(void *a) {
+
+ __m512i *x = a;
+ __m512i res= _mm512_abs_epi8(*x);
+ return res[1];
+ }
+ int main(int argc, char *argv[]) { return bar(argv[0]); }
+ '''), error_message: 'AVX512BW not available').allowed())
+
have_pvrdma = get_option('pvrdma') \
.require(rdma.found(), error_message: 'PVRDMA requires OpenFabrics libraries') \
.require(cc.compiles(gnu_source_prefix + '''
diff --git a/meson_options.txt b/meson_options.txt
index e58e158396..07194bf680 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -104,6 +104,8 @@ option('avx2', type: 'feature', value: 'auto',
description: 'AVX2 optimizations')
option('avx512f', type: 'feature', value: 'disabled',
description: 'AVX512F optimizations')
+option('avx512bw', type: 'feature', value: 'auto',
+ description: 'AVX512BW optimizations')
option('keyring', type: 'feature', value: 'auto',
description: 'Linux keyring support')
diff --git a/migration/ram.c b/migration/ram.c
index dc1de9ddbc..ff4c15c9c3 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -83,6 +83,34 @@
/* 0x80 is reserved in migration.h start with 0x100 next */
#define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100
+int (*xbzrle_encode_buffer_func)(uint8_t *, uint8_t *, int,
+ uint8_t *, int) = xbzrle_encode_buffer;
+#if defined(CONFIG_AVX512BW_OPT)
+#include "qemu/cpuid.h"
+static void __attribute__((constructor)) init_cpu_flag(void)
+{
+ unsigned max = __get_cpuid_max(0, NULL);
+ int a, b, c, d;
+ if (max >= 1) {
+ __cpuid(1, a, b, c, d);
+ /* We must check that AVX is not just available, but usable. */
+ if ((c & bit_OSXSAVE) && (c & bit_AVX) && max >= 7) {
+ int bv;
+ __asm("xgetbv" : "=a"(bv), "=d"(d) : "c"(0));
+ __cpuid_count(7, 0, a, b, c, d);
+ /* 0xe6:
+ * XCR0[7:5] = 111b (OPMASK state, upper 256-bit of ZMM0-ZMM15
+ * and ZMM16-ZMM31 state are enabled by OS)
+ * XCR0[2:1] = 11b (XMM state and YMM state are enabled by OS)
+ */
+ if ((bv & 0xe6) == 0xe6 && (b & bit_AVX512BW)) {
+ xbzrle_encode_buffer_func = xbzrle_encode_buffer_avx512;
+ }
+ }
+ }
+}
+#endif
+
XBZRLECacheStats xbzrle_counters;
/* struct contains XBZRLE cache and a static page
@@ -802,9 +830,9 @@ static int save_xbzrle_page(RAMState *rs, uint8_t **current_data,
memcpy(XBZRLE.current_buf, *current_data, TARGET_PAGE_SIZE);
/* XBZRLE encoding (if there is no overflow) */
- encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
- TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
- TARGET_PAGE_SIZE);
+ encoded_len = xbzrle_encode_buffer_func(prev_cached_page, XBZRLE.current_buf,
+ TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
+ TARGET_PAGE_SIZE);
/*
* Update the cache contents, so that it corresponds to the data
diff --git a/migration/xbzrle.c b/migration/xbzrle.c
index 1ba482ded9..05366e86c0 100644
--- a/migration/xbzrle.c
+++ b/migration/xbzrle.c
@@ -174,3 +174,127 @@ int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen)
return d;
}
+
+#if defined(CONFIG_AVX512BW_OPT)
+#pragma GCC push_options
+#pragma GCC target("avx512bw")
+#include <immintrin.h>
+int xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
+ uint8_t *dst, int dlen)
+{
+ uint32_t zrun_len = 0, nzrun_len = 0;
+ int d = 0, i = 0, num = 0;
+ uint8_t *nzrun_start = NULL;
+ /* add 1 to include residual part in main loop */
+ uint32_t count512s = (slen >> 6) + 1;
+ /* countResidual is tail of data, i.e., countResidual = slen % 64 */
+ uint32_t count_residual = slen & 0b111111;
+ bool never_same = true;
+ uint64_t mask_residual = 1;
+ mask_residual <<= count_residual;
+ mask_residual -= 1;
+ __m512i r = _mm512_set1_epi32(0);
+
+ while (count512s) {
+ if (d + 2 > dlen) {
+ return -1;
+ }
+
+ int bytes_to_check = 64;
+ uint64_t mask = 0xffffffffffffffff;
+ if (count512s == 1) {
+ bytes_to_check = count_residual;
+ mask = mask_residual;
+ }
+ __m512i old_data = _mm512_mask_loadu_epi8(r,
+ mask, old_buf + i);
+ __m512i new_data = _mm512_mask_loadu_epi8(r,
+ mask, new_buf + i);
+ uint64_t comp = _mm512_cmpeq_epi8_mask(old_data, new_data);
+ count512s--;
+
+ bool is_same = (comp & 0x1);
+ while (bytes_to_check) {
+ if (is_same) {
+ if (nzrun_len) {
+ d += uleb128_encode_small(dst + d, nzrun_len);
+ if (d + nzrun_len > dlen) {
+ return -1;
+ }
+ nzrun_start = new_buf + i - nzrun_len;
+ memcpy(dst + d, nzrun_start, nzrun_len);
+ d += nzrun_len;
+ nzrun_len = 0;
+ }
+ /* 64 data at a time for speed */
+ if (count512s && (comp == 0xffffffffffffffff)) {
+ i += 64;
+ zrun_len += 64;
+ break;
+ }
+ never_same = false;
+ num = __builtin_ctzll(~comp);
+ num = (num < bytes_to_check) ? num : bytes_to_check;
+ zrun_len += num;
+ bytes_to_check -= num;
+ comp >>= num;
+ i += num;
+ if (bytes_to_check) {
+ /* still has different data after same data */
+ d += uleb128_encode_small(dst + d, zrun_len);
+ zrun_len = 0;
+ } else {
+ break;
+ }
+ }
+ if (never_same || zrun_len) {
+ /*
+ * never_same only acts if
+ * data begins with diff in first count512s
+ */
+ d += uleb128_encode_small(dst + d, zrun_len);
+ zrun_len = 0;
+ never_same = false;
+ }
+ /* has diff, 64 data at a time for speed */
+ if ((bytes_to_check == 64) && (comp == 0x0)) {
+ i += 64;
+ nzrun_len += 64;
+ break;
+ }
+ num = __builtin_ctzll(comp);
+ num = (num < bytes_to_check) ? num : bytes_to_check;
+ nzrun_len += num;
+ bytes_to_check -= num;
+ comp >>= num;
+ i += num;
+ if (bytes_to_check) {
+ /* mask like 111000 */
+ d += uleb128_encode_small(dst + d, nzrun_len);
+ /* overflow */
+ if (d + nzrun_len > dlen) {
+ return -1;
+ }
+ nzrun_start = new_buf + i - nzrun_len;
+ memcpy(dst + d, nzrun_start, nzrun_len);
+ d += nzrun_len;
+ nzrun_len = 0;
+ is_same = true;
+ }
+ }
+ }
+
+ if (nzrun_len != 0) {
+ d += uleb128_encode_small(dst + d, nzrun_len);
+ /* overflow */
+ if (d + nzrun_len > dlen) {
+ return -1;
+ }
+ nzrun_start = new_buf + i - nzrun_len;
+ memcpy(dst + d, nzrun_start, nzrun_len);
+ d += nzrun_len;
+ }
+ return d;
+}
+#pragma GCC pop_options
+#endif
diff --git a/migration/xbzrle.h b/migration/xbzrle.h
index a0db507b9c..6feb49160a 100644
--- a/migration/xbzrle.h
+++ b/migration/xbzrle.h
@@ -18,4 +18,8 @@ int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
uint8_t *dst, int dlen);
int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
+#if defined(CONFIG_AVX512BW_OPT)
+int xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
+ uint8_t *dst, int dlen);
+#endif
#endif
--
2.25.1
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v6 2/2] Unit test code and benchmark code
2022-08-26 9:57 [PATCH v6 0/2] This patch updates AVX512 support for xbzrle ling xu
2022-08-26 9:57 ` [PATCH v6 1/2] Update AVX512 support for xbzrle_encode_buffer ling xu
@ 2022-08-26 9:57 ` ling xu
2022-11-14 13:33 ` Juan Quintela
1 sibling, 1 reply; 7+ messages in thread
From: ling xu @ 2022-08-26 9:57 UTC (permalink / raw)
To: qemu-devel; +Cc: quintela, dgilbert, ling xu, Zhou Zhao, Jun Jin
Unit test code is in test-xbzrle.c, and benchmark code is in xbzrle-bench.c
for performance benchmarking.
Signed-off-by: ling xu <ling1.xu@intel.com>
Co-authored-by: Zhou Zhao <zhou.zhao@intel.com>
Co-authored-by: Jun Jin <jun.i.jin@intel.com>
---
tests/bench/meson.build | 4 +
tests/bench/xbzrle-bench.c | 465 +++++++++++++++++++++++++++++++++++++
tests/unit/test-xbzrle.c | 39 +++-
3 files changed, 503 insertions(+), 5 deletions(-)
create mode 100644 tests/bench/xbzrle-bench.c
diff --git a/tests/bench/meson.build b/tests/bench/meson.build
index 279a8fcc33..daefead58d 100644
--- a/tests/bench/meson.build
+++ b/tests/bench/meson.build
@@ -3,6 +3,10 @@ qht_bench = executable('qht-bench',
sources: 'qht-bench.c',
dependencies: [qemuutil])
+xbzrle_bench = executable('xbzrle-bench',
+ sources: 'xbzrle-bench.c',
+ dependencies: [qemuutil,migration])
+
executable('atomic_add-bench',
sources: files('atomic_add-bench.c'),
dependencies: [qemuutil],
diff --git a/tests/bench/xbzrle-bench.c b/tests/bench/xbzrle-bench.c
new file mode 100644
index 0000000000..d71397e6f4
--- /dev/null
+++ b/tests/bench/xbzrle-bench.c
@@ -0,0 +1,465 @@
+/*
+ * Xor Based Zero Run Length Encoding unit tests.
+ *
+ * Copyright 2013 Red Hat, Inc. and/or its affiliates
+ *
+ * Authors:
+ * Orit Wasserman <owasserm@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+#include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "../migration/xbzrle.h"
+
+#define XBZRLE_PAGE_SIZE 4096
+
+#if defined(CONFIG_AVX512BW_OPT)
+static bool is_cpu_support_avx512bw;
+#include "qemu/cpuid.h"
+static void __attribute__((constructor)) init_cpu_flag(void)
+{
+ unsigned max = __get_cpuid_max(0, NULL);
+ int a, b, c, d;
+ is_cpu_support_avx512bw = false;
+ if (max >= 1) {
+ __cpuid(1, a, b, c, d);
+ /* We must check that AVX is not just available, but usable. */
+ if ((c & bit_OSXSAVE) && (c & bit_AVX) && max >= 7) {
+ int bv;
+ __asm("xgetbv" : "=a"(bv), "=d"(d) : "c"(0));
+ __cpuid_count(7, 0, a, b, c, d);
+ /* 0xe6:
+ * XCR0[7:5] = 111b (OPMASK state, upper 256-bit of ZMM0-ZMM15
+ * and ZMM16-ZMM31 state are enabled by OS)
+ * XCR0[2:1] = 11b (XMM state and YMM state are enabled by OS)
+ */
+ if ((bv & 0xe6) == 0xe6 && (b & bit_AVX512BW)) {
+ is_cpu_support_avx512bw = true;
+ }
+ }
+ }
+ return ;
+}
+#endif
+
+struct ResTime {
+ float t_raw;
+ float t_512;
+};
+
+static void encode_decode_zero(struct ResTime *res)
+{
+ uint8_t *buffer = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ int i = 0;
+ int dlen = 0, dlen512 = 0;
+ int diff_len = g_test_rand_int_range(0, XBZRLE_PAGE_SIZE - 1006);
+
+ for (i = diff_len; i > 0; i--) {
+ buffer[1000 + i] = i;
+ buffer512[1000 + i] = i;
+ }
+
+ buffer[1000 + diff_len + 3] = 103;
+ buffer[1000 + diff_len + 5] = 105;
+
+ buffer512[1000 + diff_len + 3] = 103;
+ buffer512[1000 + diff_len + 5] = 105;
+
+ /* encode zero page */
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ dlen = xbzrle_encode_buffer(buffer, buffer, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ g_assert(dlen == 0);
+
+ t_start512 = clock();
+ dlen512 = xbzrle_encode_buffer_avx512(buffer512, buffer512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ g_assert(dlen512 == 0);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(buffer);
+ g_free(compressed);
+ g_free(buffer512);
+ g_free(compressed512);
+
+}
+
+static void test_encode_decode_zero_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_zero(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("Zero test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+static void encode_decode_unchanged(struct ResTime *res)
+{
+ uint8_t *compressed = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ int i = 0;
+ int dlen = 0, dlen512 = 0;
+ int diff_len = g_test_rand_int_range(0, XBZRLE_PAGE_SIZE - 1006);
+
+ for (i = diff_len; i > 0; i--) {
+ test[1000 + i] = i + 4;
+ test512[1000 + i] = i + 4;
+ }
+
+ test[1000 + diff_len + 3] = 107;
+ test[1000 + diff_len + 5] = 109;
+
+ test512[1000 + diff_len + 3] = 107;
+ test512[1000 + diff_len + 5] = 109;
+
+ /* test unchanged buffer */
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ dlen = xbzrle_encode_buffer(test, test, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ g_assert(dlen == 0);
+
+ t_start512 = clock();
+ dlen512 = xbzrle_encode_buffer_avx512(test512, test512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ g_assert(dlen512 == 0);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(test);
+ g_free(compressed);
+ g_free(test512);
+ g_free(compressed512);
+
+}
+
+static void test_encode_decode_unchanged_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_unchanged(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("Unchanged test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+static void encode_decode_1_byte(struct ResTime *res)
+{
+ uint8_t *buffer = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed = g_malloc(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc(XBZRLE_PAGE_SIZE);
+ int dlen = 0, rc = 0, dlen512 = 0, rc512 = 0;
+ uint8_t buf[2];
+ uint8_t buf512[2];
+
+ test[XBZRLE_PAGE_SIZE - 1] = 1;
+ test512[XBZRLE_PAGE_SIZE - 1] = 1;
+
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ dlen = xbzrle_encode_buffer(buffer, test, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ g_assert(dlen == (uleb128_encode_small(&buf[0], 4095) + 2));
+
+ rc = xbzrle_decode_buffer(compressed, dlen, buffer, XBZRLE_PAGE_SIZE);
+ g_assert(rc == XBZRLE_PAGE_SIZE);
+ g_assert(memcmp(test, buffer, XBZRLE_PAGE_SIZE) == 0);
+
+ t_start512 = clock();
+ dlen512 = xbzrle_encode_buffer_avx512(buffer512, test512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ g_assert(dlen512 == (uleb128_encode_small(&buf512[0], 4095) + 2));
+
+ rc512 = xbzrle_decode_buffer(compressed512, dlen512, buffer512,
+ XBZRLE_PAGE_SIZE);
+ g_assert(rc512 == XBZRLE_PAGE_SIZE);
+ g_assert(memcmp(test512, buffer512, XBZRLE_PAGE_SIZE) == 0);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(buffer);
+ g_free(compressed);
+ g_free(test);
+ g_free(buffer512);
+ g_free(compressed512);
+ g_free(test512);
+
+}
+
+static void test_encode_decode_1_byte_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_1_byte(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("1 byte test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+static void encode_decode_overflow(struct ResTime *res)
+{
+ uint8_t *compressed = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *test512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ int i = 0, rc = 0, rc512 = 0;
+
+ for (i = 0; i < XBZRLE_PAGE_SIZE / 2 - 1; i++) {
+ test[i * 2] = 1;
+ test512[i * 2] = 1;
+ }
+
+ /* encode overflow */
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ rc = xbzrle_encode_buffer(buffer, test, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ g_assert(rc == -1);
+
+ t_start512 = clock();
+ rc512 = xbzrle_encode_buffer_avx512(buffer512, test512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ g_assert(rc512 == -1);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(buffer);
+ g_free(compressed);
+ g_free(test);
+ g_free(buffer512);
+ g_free(compressed512);
+ g_free(test512);
+
+}
+
+static void test_encode_decode_overflow_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_overflow(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("Overflow test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+static void encode_decode_range_avx512(struct ResTime *res)
+{
+ uint8_t *buffer = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed = g_malloc(XBZRLE_PAGE_SIZE);
+ uint8_t *test = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc(XBZRLE_PAGE_SIZE);
+ uint8_t *test512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ int i = 0, rc = 0, rc512 = 0;
+ int dlen = 0, dlen512 = 0;
+
+ int diff_len = g_test_rand_int_range(0, XBZRLE_PAGE_SIZE - 1006);
+
+ for (i = diff_len; i > 0; i--) {
+ buffer[1000 + i] = i;
+ test[1000 + i] = i + 4;
+ buffer512[1000 + i] = i;
+ test512[1000 + i] = i + 4;
+ }
+
+ buffer[1000 + diff_len + 3] = 103;
+ test[1000 + diff_len + 3] = 107;
+
+ buffer[1000 + diff_len + 5] = 105;
+ test[1000 + diff_len + 5] = 109;
+
+ buffer512[1000 + diff_len + 3] = 103;
+ test512[1000 + diff_len + 3] = 107;
+
+ buffer512[1000 + diff_len + 5] = 105;
+ test512[1000 + diff_len + 5] = 109;
+
+ /* test encode/decode */
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ dlen = xbzrle_encode_buffer(test, buffer, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ rc = xbzrle_decode_buffer(compressed, dlen, test, XBZRLE_PAGE_SIZE);
+ g_assert(rc < XBZRLE_PAGE_SIZE);
+ g_assert(memcmp(test, buffer, XBZRLE_PAGE_SIZE) == 0);
+
+ t_start512 = clock();
+ dlen512 = xbzrle_encode_buffer_avx512(test512, buffer512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ rc512 = xbzrle_decode_buffer(compressed512, dlen512, test512, XBZRLE_PAGE_SIZE);
+ g_assert(rc512 < XBZRLE_PAGE_SIZE);
+ g_assert(memcmp(test512, buffer512, XBZRLE_PAGE_SIZE) == 0);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(buffer);
+ g_free(compressed);
+ g_free(test);
+ g_free(buffer512);
+ g_free(compressed512);
+ g_free(test512);
+
+}
+
+static void test_encode_decode_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_range_avx512(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("Encode decode test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+static void encode_decode_random(struct ResTime *res)
+{
+ uint8_t *buffer = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed = g_malloc(XBZRLE_PAGE_SIZE);
+ uint8_t *test = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *buffer512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ uint8_t *compressed512 = g_malloc(XBZRLE_PAGE_SIZE);
+ uint8_t *test512 = g_malloc0(XBZRLE_PAGE_SIZE);
+ int i = 0, rc = 0, rc512 = 0;
+ int dlen = 0, dlen512 = 0;
+
+ int diff_len = g_test_rand_int_range(0, XBZRLE_PAGE_SIZE - 1);
+ /* store the index of diff */
+ int dirty_index[diff_len];
+ for (int j = 0; j < diff_len; j++) {
+ dirty_index[j] = g_test_rand_int_range(0, XBZRLE_PAGE_SIZE - 1);
+ }
+ for (i = diff_len - 1; i >= 0; i--) {
+ buffer[dirty_index[i]] = i;
+ test[dirty_index[i]] = i + 4;
+ buffer512[dirty_index[i]] = i;
+ test512[dirty_index[i]] = i + 4;
+ }
+
+ time_t t_start, t_end, t_start512, t_end512;
+ t_start = clock();
+ dlen = xbzrle_encode_buffer(test, buffer, XBZRLE_PAGE_SIZE, compressed,
+ XBZRLE_PAGE_SIZE);
+ t_end = clock();
+ float time_val = difftime(t_end, t_start);
+ rc = xbzrle_decode_buffer(compressed, dlen, test, XBZRLE_PAGE_SIZE);
+ g_assert(rc < XBZRLE_PAGE_SIZE);
+
+ t_start512 = clock();
+ dlen512 = xbzrle_encode_buffer_avx512(test512, buffer512, XBZRLE_PAGE_SIZE,
+ compressed512, XBZRLE_PAGE_SIZE);
+ t_end512 = clock();
+ float time_val512 = difftime(t_end512, t_start512);
+ rc512 = xbzrle_decode_buffer(compressed512, dlen512, test512, XBZRLE_PAGE_SIZE);
+ g_assert(rc512 < XBZRLE_PAGE_SIZE);
+
+ res->t_raw = time_val;
+ res->t_512 = time_val512;
+
+ g_free(buffer);
+ g_free(compressed);
+ g_free(test);
+ g_free(buffer512);
+ g_free(compressed512);
+ g_free(test512);
+
+}
+
+static void test_encode_decode_random_avx512(void)
+{
+ int i;
+ float time_raw = 0.0, time_512 = 0.0;
+ struct ResTime res;
+ for (i = 0; i < 10000; i++) {
+ encode_decode_random(&res);
+ time_raw += res.t_raw;
+ time_512 += res.t_512;
+ }
+ printf("Random test:\n");
+ printf("Raw xbzrle_encode time is %f ms\n", time_raw);
+ printf("512 xbzrle_encode time is %f ms\n", time_512);
+}
+
+int main(int argc, char **argv)
+{
+ g_test_init(&argc, &argv, NULL);
+ g_test_rand_int();
+ #if defined(CONFIG_AVX512BW_OPT)
+ if (likely(is_cpu_support_avx512bw)) {
+ g_test_add_func("/xbzrle/encode_decode_zero", test_encode_decode_zero_avx512);
+ g_test_add_func("/xbzrle/encode_decode_unchanged",
+ test_encode_decode_unchanged_avx512);
+ g_test_add_func("/xbzrle/encode_decode_1_byte", test_encode_decode_1_byte_avx512);
+ g_test_add_func("/xbzrle/encode_decode_overflow",
+ test_encode_decode_overflow_avx512);
+ g_test_add_func("/xbzrle/encode_decode", test_encode_decode_avx512);
+ g_test_add_func("/xbzrle/encode_decode_random", test_encode_decode_random_avx512);
+ }
+ #endif
+ return g_test_run();
+}
diff --git a/tests/unit/test-xbzrle.c b/tests/unit/test-xbzrle.c
index ef951b6e54..547046d093 100644
--- a/tests/unit/test-xbzrle.c
+++ b/tests/unit/test-xbzrle.c
@@ -16,6 +16,35 @@
#define XBZRLE_PAGE_SIZE 4096
+int (*xbzrle_encode_buffer_func)(uint8_t *, uint8_t *, int,
+ uint8_t *, int) = xbzrle_encode_buffer;
+#if defined(CONFIG_AVX512BW_OPT)
+#include "qemu/cpuid.h"
+static void __attribute__((constructor)) init_cpu_flag(void)
+{
+ unsigned max = __get_cpuid_max(0, NULL);
+ int a, b, c, d;
+ if (max >= 1) {
+ __cpuid(1, a, b, c, d);
+ /* We must check that AVX is not just available, but usable. */
+ if ((c & bit_OSXSAVE) && (c & bit_AVX) && max >= 7) {
+ int bv;
+ __asm("xgetbv" : "=a"(bv), "=d"(d) : "c"(0));
+ __cpuid_count(7, 0, a, b, c, d);
+ /* 0xe6:
+ * XCR0[7:5] = 111b (OPMASK state, upper 256-bit of ZMM0-ZMM15
+ * and ZMM16-ZMM31 state are enabled by OS)
+ * XCR0[2:1] = 11b (XMM state and YMM state are enabled by OS)
+ */
+ if ((bv & 0xe6) == 0xe6 && (b & bit_AVX512BW)) {
+ xbzrle_encode_buffer_func = xbzrle_encode_buffer_avx512;
+ }
+ }
+ }
+ return ;
+}
+#endif
+
static void test_uleb(void)
{
uint32_t i, val;
@@ -54,7 +83,7 @@ static void test_encode_decode_zero(void)
buffer[1000 + diff_len + 5] = 105;
/* encode zero page */
- dlen = xbzrle_encode_buffer(buffer, buffer, XBZRLE_PAGE_SIZE, compressed,
+ dlen = xbzrle_encode_buffer_func(buffer, buffer, XBZRLE_PAGE_SIZE, compressed,
XBZRLE_PAGE_SIZE);
g_assert(dlen == 0);
@@ -78,7 +107,7 @@ static void test_encode_decode_unchanged(void)
test[1000 + diff_len + 5] = 109;
/* test unchanged buffer */
- dlen = xbzrle_encode_buffer(test, test, XBZRLE_PAGE_SIZE, compressed,
+ dlen = xbzrle_encode_buffer_func(test, test, XBZRLE_PAGE_SIZE, compressed,
XBZRLE_PAGE_SIZE);
g_assert(dlen == 0);
@@ -96,7 +125,7 @@ static void test_encode_decode_1_byte(void)
test[XBZRLE_PAGE_SIZE - 1] = 1;
- dlen = xbzrle_encode_buffer(buffer, test, XBZRLE_PAGE_SIZE, compressed,
+ dlen = xbzrle_encode_buffer_func(buffer, test, XBZRLE_PAGE_SIZE, compressed,
XBZRLE_PAGE_SIZE);
g_assert(dlen == (uleb128_encode_small(&buf[0], 4095) + 2));
@@ -121,7 +150,7 @@ static void test_encode_decode_overflow(void)
}
/* encode overflow */
- rc = xbzrle_encode_buffer(buffer, test, XBZRLE_PAGE_SIZE, compressed,
+ rc = xbzrle_encode_buffer_func(buffer, test, XBZRLE_PAGE_SIZE, compressed,
XBZRLE_PAGE_SIZE);
g_assert(rc == -1);
@@ -152,7 +181,7 @@ static void encode_decode_range(void)
test[1000 + diff_len + 5] = 109;
/* test encode/decode */
- dlen = xbzrle_encode_buffer(test, buffer, XBZRLE_PAGE_SIZE, compressed,
+ dlen = xbzrle_encode_buffer_func(test, buffer, XBZRLE_PAGE_SIZE, compressed,
XBZRLE_PAGE_SIZE);
rc = xbzrle_decode_buffer(compressed, dlen, test, XBZRLE_PAGE_SIZE);
--
2.25.1
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