Klaus Demo nginx / 8f6a00c
fix comment Igor Sysoev 15 years ago
1 changed file(s) with 3 addition(s) and 3 deletion(s). Raw diff Collapse all Expand all
1212 * described at http://www.w3.org/TR/PNG/
1313 *
1414 * The 256 element lookup table takes 1024 bytes, and it may be completely
15 * cached after processing about 30-60 bytes. So for short messages
15 * cached after processing about 30-60 bytes of data. So for short data
1616 * we use the 16 element lookup table that takes only 64 bytes and align it
1717 * to CPU cache line size. Of course, the small table adds code inside
18 * CRC32 cycle, but cache misses overhead is bigger than overhead of
19 * the additional code. For example, ngx_crc32_short() of 16 byte message
18 * CRC32 loop, but the cache misses overhead is bigger than overhead of
19 * the additional code. For example, ngx_crc32_short() of 16 bytes of data
2020 * takes half as much CPU clocks than ngx_crc32_long().
2121 */
2222