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| author |   Avi Kivity <avi@redhat.com> | 2009-09-17 11:06:49 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-22 11:57:14 +0300 |
| commit | f819ec7a576e58a2e29ff0cbb7bf84ee01d26edc (patch) | |
| tree | 89a9d8baca2fe6cbacebc7628618e1e044854047 /kvm | |
| parent | test: Add ipi_halt benchmark (diff) | |
| download | qemu-kvm-f819ec7a576e58a2e29ff0cbb7bf84ee01d26edc.tar.gz qemu-kvm-f819ec7a576e58a2e29ff0cbb7bf84ee01d26edc.tar.bz2 qemu-kvm-f819ec7a576e58a2e29ff0cbb7bf84ee01d26edc.zip | |
test: Auto-tune vmexit test
Scale up iterations until we measure at least 1G cycles.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'kvm')
| -rw-r--r-- | kvm/user/test/x86/vmexit.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/kvm/user/test/x86/vmexit.c b/kvm/user/test/x86/vmexit.c index 5088dc92d..e7cb5efe0 100644 --- a/kvm/user/test/x86/vmexit.c +++ b/kvm/user/test/x86/vmexit.c @@ -17,7 +17,7 @@ static inline unsigned long long rdtsc() return r; } -#define N (1 << 22) +#define GOAL (1ull << 30) #ifdef __x86_64__ # define R "r" @@ -93,6 +93,7 @@ static void do_test(struct test *test) { int i; unsigned long long t1, t2; + unsigned iterations = 32; void (*func)(void) = test->func; if (test->valid && !test->valid()) { @@ -100,11 +101,14 @@ static void do_test(struct test *test) return; } - t1 = rdtsc(); - for (i = 0; i < N; ++i) - func(); - t2 = rdtsc(); - printf("%s %d\n", test->name, (int)((t2 - t1) / N)); + do { + iterations *= 2; + t1 = rdtsc(); + for (i = 0; i < iterations; ++i) + func(); + t2 = rdtsc(); + } while ((t2 - t1) < GOAL); + printf("%s %d\n", test->name, (int)((t2 - t1) / iterations)); } #define ARRAY_SIZE(_x) (sizeof(_x) / sizeof((_x)[0])) |