Author: stefan2
Date: Mon Dec 26 23:44:23 2011
New Revision: 1224837
URL: http://svn.apache.org/viewvc?rev=1224837&view=rev
Log:
* subversion/libsvn_delta/xdelta.c
(block): improve commentary
Suggested by: hwright
Modified:
subversion/trunk/subversion/libsvn_delta/xdelta.c
Modified: subversion/trunk/subversion/libsvn_delta/xdelta.c
URL:
http://svn.apache.org/viewvc/subversion/trunk/subversion/libsvn_delta/xdelta.c?rev=1224837&r1=1224836&r2=1224837&view=diff
==============================================================================
--- subversion/trunk/subversion/libsvn_delta/xdelta.c (original)
+++ subversion/trunk/subversion/libsvn_delta/xdelta.c Mon Dec 26 23:44:23 2011
@@ -100,6 +100,11 @@ init_adler32(const char *data)
struct block
{
apr_uint32_t adlersum;
+
+/* Even in 64 bit systems, store only 32 bit offsets in our hash table
+ (our delta window size much much smaller then 4GB).
+ That reduces the hash table size by 50% from 32to 16KB
+ and makes it easier to fit into the CPU's L1 cache. */
apr_uint32_t pos; /* NO_POSITION -> block is not used */
};
