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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





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