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Relay a TLS record at most per read into the fixed buffers

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The fixed buffers hold 16384 + 64 bytes, a whole TLS record and its
header, which tlspr needs. sockmap() read all of that from one side and
wrote it to the other, so a side using TLS was written a full record and
another of 64 bytes for every full buffer: twice the records, twice the
writes. Data relayed into the fixed buffers is now read 16384 bytes at
most; a buffer already holding more, as tlspr can leave it, or a larger
one taken for a filter, is used whole.

Ending TLS for 1 MB answers this takes 25% more throughput from the
same CPU (Intel, 4.4 to 5.5 Gbit/s); plain relaying is not affected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Vladimir Dubrovin 2026-10-13 12:21:23 +03:00
parent 8c87b43a2a
commit 46ae2a65a0
1 changed files with 22 additions and 12 deletions
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34
src/sockmap.c
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@ -61,6 +61,16 @@ ssize_t splice(int fd_in, loff_t *off_in, int fd_out, loff_t *off_out, size_t le
before the sockets are closed. */
#define SESSIONEND (!halfclose && (CLIENTTERMREAD || SERVERTERMREAD))
/* The fixed buffers have room for a TLS record and its header, which tlspr
needs. What is relayed is read into them a record at most: written to a
side using TLS, a full buffer then makes one record rather than a record
and another of 64 bytes, which costs a third of the throughput. A buffer
already holding more, or a larger one taken for a filter, is used whole. */
#define ROOM(size, inbuf) (((size) == CLIENTBUFSIZE && (inbuf) <= CLIENTBUFSIZE - 64)? \
(unsigned)(CLIENTBUFSIZE - 64) : (unsigned)(size))
#define CLIROOM ROOM(param->clibufsize, param->cliinbuf)
#define SRVROOM ROOM(param->srvbufsize, param->srvinbuf)
/* usesplice is a mask of the directions passed with splice() rather than
through a buffer: SPLICE_DOWNLOAD, server to client, and SPLICE_UPLOAD,
client to server. */
@ -145,8 +155,8 @@ int sockmap(struct clientparam * param, int timeo, int usesplice){
#endif
if(param->srvinbuf == param->srvoffset) param->srvinbuf =param->srvoffset = 0;
if(param->cliinbuf == param->clioffset) param->cliinbuf =param->clioffset = 0;
if(param->clibufsize == param->cliinbuf) TOCLIENTBUF = 0;
if(param->srvbufsize == param->srvinbuf) TOSERVERBUF = 0;
if(param->cliinbuf >= CLIROOM) TOCLIENTBUF = 0;
if(param->srvinbuf >= SRVROOM) TOSERVERBUF = 0;
action = handlepredatflt(param);
if(action == HANDLED){
@ -264,7 +274,7 @@ log("done send to server from buf");
fromclient -= res;
param->clioffset += res;
bufrelease(param, CLIENT);
if(param->cliinbuf < param->clibufsize) TOCLIENTBUF = 1;
if(param->cliinbuf < CLIROOM) TOCLIENTBUF = 1;
if(param->bandlimfunc) {
int sl1;
sl1 = (*param->bandlimfunc)(param, 0, res);
@ -310,7 +320,7 @@ log("done send to client from buf");
fromserver -= res;
param->srvoffset += res;
bufrelease(param, SERVER);
if(param->srvinbuf < param->srvbufsize) TOSERVERBUF = 1;
if(param->srvinbuf < SRVROOM) TOSERVERBUF = 1;
needaction = 0;
continue;
}
@ -319,11 +329,11 @@ log("done send to client from buf");
/* a direction going back to copying does once its pipe is empty */
if(wantbufcli && !inclientpipe){
splicecli = wantbufcli = streakcli = 0;
if(param->cliinbuf < param->clibufsize) TOCLIENTBUF = 1;
if(param->cliinbuf < CLIROOM) TOCLIENTBUF = 1;
}
if(wantbufsrv && !inserverpipe){
splicesrv = wantbufsrv = streaksrv = 0;
if(param->srvinbuf < param->srvbufsize) TOSERVERBUF = 1;
if(param->srvinbuf < SRVROOM) TOSERVERBUF = 1;
}
{
/* each direction goes through its pipe if spliced, through its
@ -402,7 +412,7 @@ log("read from client to pipe");
if(pipecli[0] < 0 && pipe2(pipecli, O_NONBLOCK) < 0){
/* no pipe to be had: copy instead */
allowcli = splicecli = TOCLIENTPIPE = FROMCLIENTPIPE = 0;
if(param->cliinbuf < param->clibufsize) TOCLIENTBUF = 1;
if(param->cliinbuf < CLIROOM) TOCLIENTBUF = 1;
continue;
}
errno = 0;
@ -451,7 +461,7 @@ log("read from server to pipe\n");
#endif
if(pipesrv[0] < 0 && pipe2(pipesrv, O_NONBLOCK) < 0){
allowsrv = splicesrv = TOSERVERPIPE = FROMSERVERPIPE = 0;
if(param->srvinbuf < param->srvbufsize) TOSERVERBUF = 1;
if(param->srvinbuf < SRVROOM) TOSERVERBUF = 1;
continue;
}
errno = 0;
@ -509,7 +519,7 @@ log("done read from server to pipe\n");
log("read from client to buf");
#endif
sasize = sizeof(param->sincr);
res = param->srv->so._recvfrom(param->sostate, param->clisock, (char *)param->clibuf + param->cliinbuf, (int)MIN((uint64_t)param->clibufsize - param->cliinbuf, fromclient-inclientbuf), 0, (struct sockaddr *)&param->sincr, &sasize);
res = param->srv->so._recvfrom(param->sostate, param->clisock, (char *)param->clibuf + param->cliinbuf, (int)MIN((uint64_t)CLIROOM - param->cliinbuf, fromclient-inclientbuf), 0, (struct sockaddr *)&param->sincr, &sasize);
if(res <= 0) {
FROMCLIENT = 0;
if(res == 0) {
@ -542,7 +552,7 @@ log("done read from client to buf");
#endif
inclientbuf += res;
param->cliinbuf += res;
if(param->clibufsize == param->cliinbuf) TOCLIENTBUF = 0;
if(param->cliinbuf >= CLIROOM) TOCLIENTBUF = 0;
needaction = 0;
continue;
}
@ -553,7 +563,7 @@ log("done read from client to buf");
log("read from server to buf");
#endif
sasize = sizeof(param->sinsr);
res = param->srv->so._recvfrom(param->sostate, param->remsock, (char *)param->srvbuf + param->srvinbuf, (int)MIN((uint64_t)param->srvbufsize - param->srvinbuf, fromserver-inserverbuf), 0, (struct sockaddr *)&param->sinsr, &sasize);
res = param->srv->so._recvfrom(param->sostate, param->remsock, (char *)param->srvbuf + param->srvinbuf, (int)MIN((uint64_t)SRVROOM - param->srvinbuf, fromserver-inserverbuf), 0, (struct sockaddr *)&param->sinsr, &sasize);
if(res <= 0) {
FROMSERVER = 0;
if(res == 0) {
@ -591,7 +601,7 @@ log("done read from server to buf");
sl1 = (*param->bandlimfunc)(param, res, 0);
if(sl1 > sleeptime) sleeptime = sl1;
}
if(param->srvbufsize == param->srvinbuf) TOSERVERBUF = 0;
if(param->srvinbuf >= SRVROOM) TOSERVERBUF = 0;
needaction = 0;
continue;
}