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[Qemu-devel] [PATCH RESEND for 2.3 4/6] xbzrle: check 8 bytes at a time
From: |
arei.gonglei |
Subject: |
[Qemu-devel] [PATCH RESEND for 2.3 4/6] xbzrle: check 8 bytes at a time after an concurrency scene |
Date: |
Mon, 24 Nov 2014 19:55:50 +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 d27a140..0477367 100644
--- a/xbzrle.c
+++ b/xbzrle.c
@@ -50,16 +50,24 @@ 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 RESEND for 2.3 0/6] xbzrle: optimize the xbzrle, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 6/6] migration: clear the dead code, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 5/6] migration: optimize xbzrle by reducing data copy, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 1/6] xbzrle: optimize XBZRLE to decrease the cache misses, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 3/6] xbzrle: don't check the value in the vm ram repeatedly, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 2/6] xbzrle: rebuild the cache_is_cached function, arei.gonglei, 2014/11/24
- [Qemu-devel] [PATCH RESEND for 2.3 4/6] xbzrle: check 8 bytes at a time after an concurrency scene,
arei.gonglei <=