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OPTIM: http: improve parsing performance of long header lines

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A performance test with 1kB cookies was capping at 194k req/s. After
implementing multi-byte skipping, the performance increased to 212k req/s,
or 9.2% faster. This patch implements this for architectures supporting
unaligned accesses (x86_64, x86, armv7a). Maybe other architectures can
benefit from this but they were not tested yet.
This commit is contained in:
Willy Tarreau 2016-11-05 17:35:40 +01:00
parent 2235b261b6
commit 0431f9d476
1 changed files with 24 additions and 1 deletions

25
src/proto_http.c
View File

@ -1922,8 +1922,31 @@ void http_msg_analyzer(struct http_msg *msg, struct hdr_idx *idx)
/* assumes msg->sol points to the first char, and msg->sov
* points to the first character of the value.
*/
/* speedup: we'll skip packs of 4 or 8 bytes not containing bytes 0x0D
* and lower. In fact since most of the time is spent in the loop, we
* also remove the sign bit test so that bytes 0x8e..0x0d break the
* loop, but we don't care since they're very rare in header values.
*/
#if defined(__x86_64__)
while (ptr <= end - sizeof(long)) {
if ((*(long *)ptr - 0x0e0e0e0e0e0e0e0eULL) & 0x8080808080808080ULL)
goto http_msg_hdr_val2;
ptr += sizeof(long);
}
#endif
#if defined(__x86_64__) || \
defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__ARM_ARCH_7A__)
while (ptr <= end - sizeof(int)) {
if ((*(int*)ptr - 0x0e0e0e0e) & 0x80808080)
goto http_msg_hdr_val2;
ptr += sizeof(int);
}
#endif
http_msg_hdr_val2:
if (likely(!HTTP_IS_CRLF(*ptr)))
EAT_AND_JUMP_OR_RETURN(http_msg_hdr_val, HTTP_MSG_HDR_VAL);
EAT_AND_JUMP_OR_RETURN(http_msg_hdr_val2, HTTP_MSG_HDR_VAL);
msg->eol = ptr - buf->p;
/* Note: we could also copy eol into ->eoh so that we have the