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OPTIM: http: improve parsing performance of long URIs

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Searching the trailing space in long URIs takes some time. This can
happen especially on static files and some blogs. By skipping valid
character ranges by 32-bit blocks, it's possible to increase the
HTTP performance from 212k to 216k req/s on requests features a
100-character URI, which is an increase of 2%. This is done for
architectures supporting unaligned accesses (x86_64, x86, armv7a).
There's only a 32-bit version because URIs are rarely long and very
often short, so it's more efficient to limit the systematic overhead
than to try to optimize for the rarest requests.
This commit is contained in:
Willy Tarreau 2016-11-05 17:52:06 +01:00
parent 0431f9d476
commit 5f10ea30f4
1 changed files with 18 additions and 1 deletions
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19
src/proto_http.c
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@ -1519,8 +1519,25 @@ const char *http_parse_reqline(struct http_msg *msg,
case HTTP_MSG_RQURI:
http_msg_rquri:
#if defined(__x86_64__) || \
defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__ARM_ARCH_7A__)
/* speedup: skip bytes not between 0x21 and 0x7e inclusive */
while (ptr <= end - sizeof(int)) {
int x = *(int *)ptr - 0x21212121;
if (x & 0x80808080)
break;
x -= 0x5e5e5e5e;
if (!(x & 0x80808080))
break;
ptr += sizeof(int);
}
#endif
http_msg_rquri2:
if (likely((unsigned char)(*ptr - 33) <= 93)) /* 33 to 126 included */
EAT_AND_JUMP_OR_RETURN(http_msg_rquri, HTTP_MSG_RQURI);
EAT_AND_JUMP_OR_RETURN(http_msg_rquri2, HTTP_MSG_RQURI);
if (likely(HTTP_IS_SPHT(*ptr))) {
msg->sl.rq.u_l = ptr - msg_start - msg->sl.rq.u;