diff options
| author | Vijay <vijayak@cavium.com> | 2016-07-14 16:51:36 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-07-14 16:51:36 +0100 |
| commit | 7069532e3b944c25707d4f69998e68a739eabff9 (patch) | |
| tree | 7200cf21fb43f5d5093d1eada2ff291aff8227e8 | |
| parent | 56215da394e9b784d425bc27cb826baf16c18b0d (diff) | |
target-arm: Use Neon for zero checking
Use Neon instructions to perform zero checking of
buffer. This is helps in reducing total migration time.
Use case: Idle VM live migration with 4 VCPUS and 8GB ram
running CentOS 7.
Without Neon, the Total migration time is 3.5 Sec
Migration status: completed
total time: 3560 milliseconds
downtime: 33 milliseconds
setup: 5 milliseconds
transferred ram: 297907 kbytes
throughput: 685.76 mbps
remaining ram: 0 kbytes
total ram: 8519872 kbytes
duplicate: 2062760 pages
skipped: 0 pages
normal: 69808 pages
normal bytes: 279232 kbytes
dirty sync count: 3
With Neon, the total migration time is 2.9 Sec
Migration status: completed
total time: 2960 milliseconds
downtime: 65 milliseconds
setup: 4 milliseconds
transferred ram: 299869 kbytes
throughput: 830.19 mbps
remaining ram: 0 kbytes
total ram: 8519872 kbytes
duplicate: 2064313 pages
skipped: 0 pages
normal: 70294 pages
normal bytes: 281176 kbytes
dirty sync count: 3
Signed-off-by: Vijaya Kumar K <vijayak@cavium.com>
Signed-off-by: Suresh <ksuresh@cavium.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1467190029-694-2-git-send-email-vijayak@cavium.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | util/cutils.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/util/cutils.c b/util/cutils.c index 5830a688dc..7505fdaa81 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -184,6 +184,13 @@ int qemu_fdatasync(int fd) #define SPLAT(p) _mm_set1_epi8(*(p)) #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF) #define VEC_OR(v1, v2) (_mm_or_si128(v1, v2)) +#elif defined(__aarch64__) +#include "arm_neon.h" +#define VECTYPE uint64x2_t +#define ALL_EQ(v1, v2) \ + ((vgetq_lane_u64(v1, 0) == vgetq_lane_u64(v2, 0)) && \ + (vgetq_lane_u64(v1, 1) == vgetq_lane_u64(v2, 1))) +#define VEC_OR(v1, v2) ((v1) | (v2)) #else #define VECTYPE unsigned long #define SPLAT(p) (*(p) * (~0UL / 255)) |