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[Qemu-devel] [PATCH v5 08/10] xbzrle: check 8 bytes at a time after an c
From: |
arei.gonglei |
Subject: |
[Qemu-devel] [PATCH v5 08/10] xbzrle: check 8 bytes at a time after an concurrency scene |
Date: |
Fri, 4 Apr 2014 17:58:00 +0800 |
From: ChenLiang <address@hidden>
The logic of old code is correct. But Checking byte by byte will
consume time after an concurrency scene.
Signed-off-by: ChenLiang <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
xbzrle.c | 28 ++++++++++++++++++----------
1 file changed, 18 insertions(+), 10 deletions(-)
diff --git a/xbzrle.c b/xbzrle.c
index 92cccd7..9d67309 100644
--- a/xbzrle.c
+++ b/xbzrle.c
@@ -51,16 +51,24 @@ int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t
*new_buf, int slen,
/* word at a time for speed */
if (!res) {
- while (i < slen &&
- (*(long *)(old_buf + i)) == (*(long *)(new_buf + i))) {
- i += sizeof(long);
- zrun_len += sizeof(long);
- }
-
- /* go over the rest */
- while (i < slen && old_buf[i] == new_buf[i]) {
- zrun_len++;
- i++;
+ while (i < slen) {
+ if ((*(long *)(old_buf + i)) == (*(long *)(new_buf + i))) {
+ i += sizeof(long);
+ zrun_len += sizeof(long);
+ } else {
+ /* go over the rest */
+ for (j = 0; j < sizeof(long); j++) {
+ if (old_buf[i] == new_buf[i]) {
+ i++;
+ zrun_len++;
+ } else {
+ break;
+ }
+ }
+ if (j != sizeof(long)) {
+ break;
+ }
+ }
}
}
--
1.7.12.4
- [Qemu-devel] [PATCH v5 09/10] migration: optimize xbzrle by reducing data copy, (continued)
- [Qemu-devel] [PATCH v5 09/10] migration: optimize xbzrle by reducing data copy, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 03/10] migration: expose the bitmap_sync_count to the end, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 05/10] XBZRLE: optimize XBZRLE to decrease the cache misses, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 01/10] XBZRLE: Fix one XBZRLE corruption issues, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 04/10] migration: expose xbzrle cache miss rate, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 06/10] XBZRLE: rebuild the cache_is_cached function, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 07/10] xbzrle: don't check the value in the vm ram repeatedly, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 02/10] migration: Add counts of updating the dirty bitmap, arei.gonglei, 2014/04/04
- [Qemu-devel] [PATCH v5 08/10] xbzrle: check 8 bytes at a time after an concurrency scene,
arei.gonglei <=
- Re: [Qemu-devel] [PATCH v5 00/10] migration: Optimizate the xbzrle and fix one corruption issue, Dr. David Alan Gilbert, 2014/04/04
- [Qemu-devel] For 2.0? Re: [PATCH v5 00/10] migration: Optimizate the xbzrle and fix one corruption issue, Eric Blake, 2014/04/04