Two benchmarks:
1. standalone, actually uses LIBCMT's memcpy to compare.
2. Part of qxldd.dll (in display/res.c called from display/driver.c)
so using the same implementation.
Note: next commit removes benchmark code as well as fast_memcpy_* code
and related SSE check and FPU save/restore.
Results for 32 bit windows 7 give ~2 times better performance for
*system* memcpy.
64 bit windows 7 is ~2 times better for size < 128 KByte copies, and
approximately the same for 128 KB <= size <= 1 MB
More complete results:
Note: for 64 bit with 262144 <= size <= 1048576 I got mixed results,
depending on the order of performing the comparison - if memcpy was run
first I got better results for fast_memcpy, by about 20%, for 64 bit
only (for 32 bit memcpy/RtlCopyMemory was still faster).
Windows 7 32 bit:
size [bytes] our time/system time [percent]
1024 232
2048 352
4096 681
8192 303
16384 455
32768 403
65536 352
131072 232
262144 232
524288 152
1048576 177
Windows 7 64 bit:
size [bytes] our time/system time [percent]
1024 140
2048 204
4096 200
8192 198
16384 232
32768 173
65536 272
131072 177
262144 134
524288 115
1048576 115
---
xddm/display/benchmark_memcpy.c | 152 +++++++++++++++++++++++++++++++++
xddm/display/driver.c | 4 +
xddm/display/res.c | 57 +++++++++++++
xddm/tests/benchmark_format_results.py | 38 +++++++++
xddm/tests/build_benchmark.bat | 7 ++
5 files changed, 258 insertions(+)
create mode 100644 xddm/display/benchmark_memcpy.c
create mode 100644 xddm/tests/benchmark_format_results.py
create mode 100644 xddm/tests/build_benchmark.bat
diff --git a/xddm/display/benchmark_memcpy.c b/xddm/display/benchmark_memcpy.c
new file mode 100644
index 0000000..fa44577
--- /dev/null
+++ b/xddm/display/benchmark_memcpy.c
@@ -0,0 +1,152 @@
+#include <windows.h>
+#include <stdio.h>
+
+#ifdef _WIN64
+int have_sse2 = 0;
+void fast_memcpy_aligned(void *dest, const void *src, size_t len);
+#else
+static _inline void fast_memcpy_aligned(void *dest, const void *src, size_t len)
+{
+ _asm
+ {
+ mov ecx, len
+ mov esi, src
+ mov edi, dest
+
+ cmp ecx, 128
+ jb try_to_copy64
+
+ prefetchnta [esi]
+ copy_128:
+ prefetchnta [esi + 64]
+
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ movdqa xmm2, [esi + 32]
+ movdqa xmm3, [esi + 48]
+
+ prefetchnta [esi + 128]
+
+ movntdq [edi], xmm0
+ movntdq [edi + 16], xmm1
+ movntdq [edi + 32], xmm2
+ movntdq [edi + 48], xmm3
+
+ movdqa xmm0, [esi + 64]
+ movdqa xmm1, [esi + 80]
+ movdqa xmm2, [esi + 96]
+ movdqa xmm3, [esi + 112]
+
+ movntdq [edi + 64], xmm0
+ movntdq [edi + 80], xmm1
+ movntdq [edi + 96], xmm2
+ movntdq [edi + 112], xmm3
+
+ add edi, 128
+ add esi, 128
+ sub ecx, 128
+ cmp ecx, 128
+ jae copy_128
+
+ try_to_copy64:
+ cmp ecx, 64
+ jb try_to_copy32
+
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ movdqa xmm2, [esi + 32]
+ movdqa xmm3, [esi + 48]
+
+ movntdq [edi], xmm0
+ movntdq [edi + 16], xmm1
+ movntdq [edi + 32], xmm2
+ movntdq [edi + 48], xmm3
+
+ add edi, 64
+ add esi, 64
+ sub ecx, 64
+ prefetchnta [esi]
+
+ try_to_copy32:
+ cmp ecx, 32
+ jb try_to_copy16
+
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ movntdq [edi], xmm0
+ movntdq [edi + 16], xmm1
+
+ add edi, 32
+ add esi, 32
+ sub ecx, 32
+
+ try_to_copy16:
+ cmp ecx, 16
+ jb try_to_copy4
+
+ movdqa xmm0, [esi]
+ movntdq [edi], xmm0
+
+ add edi, 16
+ add esi, 16
+ sub ecx, 16
+
+
+ try_to_copy4:
+ cmp ecx, 4
+ jb try_to_copy_1
+ movsd
+ sub ecx, 4
+ jmp try_to_copy4
+
+ try_to_copy_1:
+ rep movsb
+
+ sfence
+ }
+}
+#endif
+
+typedef unsigned long long uint64_t;
+
+uint64_t time_usecs(void)
+{
+ SYSTEMTIME systime;
+ GetSystemTime(&systime);
+ return systime.wMilliseconds * 1000 + systime.wSecond * 1e6 + systime.wMinute * 60e6 + systime.wHour * 3600e6;
+}
+
+int main(void)
+{
+ int i;
+ unsigned char *src_unaligned;
+ unsigned char *dest_unaligned;
+ uint64_t start, total1, total2;
+ unsigned char *src = NULL;
+ unsigned char *dest = NULL;
+ size_t size = 1024;
+ size_t iter = 1024 * 1024;
+
+ printf("fast_memcpy compared to memcpy (< 1.0 means memcpy is better)\n");
+ for (size = 1024; size < 1024*1024*2; size *= 2, iter /= 2) {
+ src_unaligned = malloc(size + 15);
+ dest_unaligned = malloc(size + 15);
+ src = (unsigned char *)((size_t)(src_unaligned + 15) & ~0xf);
+ dest = (unsigned char *)((size_t)(dest_unaligned + 15) & ~0xf);
+ start = time_usecs();
+ for (i = 0 ; i < iter ; ++i)
+ memcpy(dest, src, size);
+ total1 = time_usecs() - start;
+
+ start = time_usecs();
+ for (i = 0 ; i < iter ; ++i)
+ fast_memcpy_aligned(dest, src, size);
+ total2 = time_usecs() - start;
+
+ printf("%d: %f (%d, ", size, ((float)total1) / total2, total1);
+ printf("%d)\n", total2);
+ free(src_unaligned);
+ free(dest_unaligned);
+ }
+ return 0;
+}
diff --git a/xddm/display/driver.c b/xddm/display/driver.c
index 5a3dbfa..bed1d58 100644
--- a/xddm/display/driver.c
+++ b/xddm/display/driver.c
@@ -903,6 +903,8 @@ VOID EnableQXLPrimarySurface(PDev *pdev)
pdev->surf_enable = TRUE;
}
+void benchmark_memcpy(PDev *pdev);
+
HSURF DrvEnableSurface(DHPDEV in_pdev)
{
PDev *pdev;
@@ -941,6 +943,8 @@ HSURF DrvEnableSurface(DHPDEV in_pdev)
EnableQXLPrimarySurface(pdev);
+ benchmark_memcpy(pdev);
+
DEBUG_PRINT((pdev, 1, "%s: 0x%lx exit\n", __FUNCTION__, pdev));
return surf;
diff --git a/xddm/display/res.c b/xddm/display/res.c
index 60e9bcb..589218b 100644
--- a/xddm/display/res.c
+++ b/xddm/display/res.c
@@ -1283,6 +1283,63 @@ static _inline void fast_memcpy_unaligment(void *dest, const void *src, size_t l
#endif
+uint64_t time_usecs(void)
+{
+ ENG_TIME_FIELDS systime;
+ EngQueryLocalTime(&systime);
+ return (uint64_t)(systime.usMilliseconds * 1000 + systime.usSecond * 1e6 +
+ systime.usMinute * 60e6 + systime.usHour * 3600e6);
+}
+
+void benchmark_memcpy(PDev *pdev)
+{
+ size_t i;
+ unsigned char *src_unaligned;
+ unsigned char *dest_unaligned;
+ uint64_t start, total1, total2;
+ unsigned char *src = NULL;
+ unsigned char *dest = NULL;
+ size_t size = 1024;
+ size_t iter = 1024 * 1024;
+
+ for (size = 1024; size < 1024*1024*2; size *= 2, iter /= 2) {
+ src_unaligned = EngAllocMem(0, size + 31, ALLOC_TAG);
+ dest_unaligned = EngAllocMem(0, size + 31, ALLOC_TAG);
+ src = (unsigned char *)((size_t)(src_unaligned + 31) & ~0x1f);
+ dest = (unsigned char *)((size_t)(dest_unaligned + 31) & ~0x1f);
+
+ for (i = 0 ; i < size ; ++i)
+ src[i] = i;
+
+ start = time_usecs();
+ for (i = 0 ; i < iter ; ++i) {
+ fast_memcpy_aligned(dest, src, size);
+ }
+ total2 = time_usecs() - start;
+
+ {
+ int errors = 0;
+ for (i = 0 ; i < size ; ++i) {
+ if (dest[i] != src[i]) {
+ errors++;
+ }
+ }
+ if (errors > 0) {
+ DEBUG_PRINT((pdev, 1, "!!! copy errors %d !!!\n", errors));
+ }
+ }
+
+ start = time_usecs();
+ for (i = 0 ; i < iter ; ++i)
+ memcpy(dest, src, size);
+ total1 = time_usecs() - start;
+
+ DEBUG_PRINT((pdev, 1, "%d: %lld, %lld\n", size, total1, total2));
+ EngFreeMem(src_unaligned);
+ EngFreeMem(dest_unaligned);
+ }
+}
+
#ifdef DBG
#define PutBytesAlign __PutBytesAlign
#define PutBytes(pdev, chunk, now, end, src, size, page_counter, alloc_size, use_sse)\
diff --git a/xddm/tests/benchmark_format_results.py b/xddm/tests/benchmark_format_results.py
new file mode 100644
index 0000000..96d302b
--- /dev/null
+++ b/xddm/tests/benchmark_format_results.py
@@ -0,0 +1,38 @@
+import sys
+
+win7_32="""qxl/guest-0: 96463384453: qxldd: 1024: 47000, 109000
+qxl/guest-0: 96591785177: qxldd: 2048: 31000, 109000
+qxl/guest-0: 96722899152: qxldd: 4096: 16000, 109000
+qxl/guest-0: 96851422238: qxldd: 8192: 31000, 94000
+qxl/guest-0: 97013842048: qxldd: 16384: 31000, 141000
+qxl/guest-0: 97167323122: qxldd: 32768: 31000, 125000
+qxl/guest-0: 97316872306: qxldd: 65536: 31000, 109000
+qxl/guest-0: 97465747407: qxldd: 131072: 47000, 109000
+qxl/guest-0: 97624668249: qxldd: 262144: 47000, 109000
+qxl/guest-0: 97785876639: qxldd: 524288: 62000, 94000
+qxl/guest-0: 97953480643: qxldd: 1048576: 62000, 110000
+"""
+
+win7_64="""
+qxl/guest-0: 2278149101498: qxldd: 1024: 78000, 109000
+qxl/guest-0: 2278288271327: qxldd: 2048: 46000, 94000
+qxl/guest-0: 2278428135167: qxldd: 4096: 47000, 94000
+qxl/guest-0: 2278575078269: qxldd: 8192: 47000, 93000
+qxl/guest-0: 2278734906600: qxldd: 16384: 47000, 109000
+qxl/guest-0: 2278896881683: qxldd: 32768: 63000, 109000
+qxl/guest-0: 2279073699223: qxldd: 65536: 46000, 125000
+qxl/guest-0: 2279250403663: qxldd: 131072: 62000, 110000
+qxl/guest-0: 2279467314681: qxldd: 262144: 93000, 125000
+qxl/guest-0: 2279693375414: qxldd: 524288: 109000, 125000
+qxl/guest-0: 2279929972847: qxldd: 1048576: 109000, 125000
+"""
+
+filt = lambda txt: filt2(filt1(txt))
+filt2 = lambda data: [(s, system, ours*100.0/system) for t, s, system, ours in data]
+filt1 = lambda txt: map(lambda a: (int(a[1][:-1]), int(a[3][:-1]), int(a[4][:-1]), int(a[5])), map(lambda l: l.strip().split(), [l for l in txt.split('\n') if l.strip() != '']))
+display = lambda txt: sys.stdout.write('\n'.join('%10s %10s' % (a, '%3.0f' % c) for a, b, c in filt(txt))+'\n')
+
+print('size [bytes]'.ljust(18) + 'our time/system time [percent]')
+display(win7_32)
+print('size [bytes]'.ljust(18) + 'our time/system time [percent]')
+display(win7_64)
diff --git a/xddm/tests/build_benchmark.bat b/xddm/tests/build_benchmark.bat
new file mode 100644
index 0000000..a184249
--- /dev/null
+++ b/xddm/tests/build_benchmark.bat
@@ -0,0 +1,7 @@
+cl /Zi /nologo /c /I %CRT_INC_PATH% ..\display\benchmark_memcpy.c
+if defined AMD64 (
+ml64 /c /Zd ..\display\amd64\x64.asm
+link /nologo /debug /libpath:%BASEDIR%\lib\crt\amd64\ /libpath:%DDK_LIB_DEST%\amd64 x64.obj benchmark_memcpy.obj
+) else (
+link /nologo /debug /libpath:%BASEDIR%\lib\crt\i386\ /libpath:%DDK_LIB_DEST%\i386 benchmark_memcpy.obj
+)
--
1.9.0
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