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kvm-unit-test: Improve benchmark measuring

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This commit is contained in:
Fabian 2020-12-31 19:14:30 -06:00
commit 77dceb6d02
1 changed files with 16 additions and 14 deletions
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30
tests/kvm-unit-tests/x86/realmode.c
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@ -1582,9 +1582,11 @@ static void test_nopl(void)
report("nopl", 0, 1);
}
static u32 perf_baseline;
static u64 perf_baseline;
#define PERF_COUNT 1000000
#define PERF_COUNT_SHIFT (27)
// 2**27 = ~1 second at 100 mIPS
#define PERF_COUNT (1 << PERF_COUNT_SHIFT)
#define MK_INSN_PERF(name, insn) \
MK_INSN(name, "rdtsc; mov %eax, %ebx; mov %edx, %esi\n" \
@ -1592,7 +1594,7 @@ static u32 perf_baseline;
".byte 0x67; loop 1b\n" \
"rdtsc");
static u32 cycles_in_big_real_mode(struct insn_desc *insn)
static u64 cycles_in_big_real_mode(struct insn_desc *insn)
{
u64 start, end;
@ -1616,63 +1618,63 @@ static void test_perf_loop(void)
*/
MK_INSN_PERF(perf_loop, "");
perf_baseline = cycles_in_big_real_mode(&insn_perf_loop);
print_serial_u32(perf_baseline / (PERF_COUNT + 3));
print_serial_u32(perf_baseline >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated jump instruction\n");
}
static void test_perf_mov(void)
{
u32 cyc;
u64 cyc;
MK_INSN_PERF(perf_move, "mov %esi, %edi");
cyc = cycles_in_big_real_mode(&insn_perf_move);
print_serial_u32((cyc - perf_baseline) / PERF_COUNT);
print_serial_u32(cyc >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated move instruction\n");
}
static void test_perf_arith(void)
{
u32 cyc;
u64 cyc;
MK_INSN_PERF(perf_arith, "add $4, %edi");
cyc = cycles_in_big_real_mode(&insn_perf_arith);
print_serial_u32((cyc - perf_baseline) / PERF_COUNT);
print_serial_u32(cyc >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated arithmetic instruction\n");
}
static void test_perf_memory_load(void)
{
u32 cyc, tmp;
u64 cyc, tmp;
MK_INSN_PERF(perf_memory_load, "cmp $0, (%edi)");
init_inregs(&(struct regs){ .edi = (u32)&tmp });
cyc = cycles_in_big_real_mode(&insn_perf_memory_load);
print_serial_u32((cyc - perf_baseline) / PERF_COUNT);
print_serial_u32(cyc >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated memory load instruction\n");
}
static void test_perf_memory_store(void)
{
u32 cyc, tmp;
u64 cyc, tmp;
MK_INSN_PERF(perf_memory_store, "mov %ax, (%edi)");
init_inregs(&(struct regs){ .edi = (u32)&tmp });
cyc = cycles_in_big_real_mode(&insn_perf_memory_store);
print_serial_u32((cyc - perf_baseline) / PERF_COUNT);
print_serial_u32(cyc >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated memory store instruction\n");
}
static void test_perf_memory_rmw(void)
{
u32 cyc, tmp;
u64 cyc, tmp;
MK_INSN_PERF(perf_memory_rmw, "add $1, (%edi)");
init_inregs(&(struct regs){ .edi = (u32)&tmp });
cyc = cycles_in_big_real_mode(&insn_perf_memory_rmw);
print_serial_u32((cyc - perf_baseline) / PERF_COUNT);
print_serial_u32(cyc >> PERF_COUNT_SHIFT);
print_serial(" cycles/emulated memory RMW instruction\n");
}