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passt: Spare some syscalls, add some optimisations from profiling
Avoid a bunch of syscalls on forwarding paths by: - storing minimum and maximum file descriptor numbers for each protocol, fall back to SO_PROTOCOL query only on overlaps - allocating a larger receive buffer -- this can result in more coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024), so make sure we don't exceed that within a single call to protocol tap handlers - nesting the handling loop in tap_handler() in the receive loop, so that we have better chances of filling our receive buffer in fewer calls - skipping the recvfrom() in the UDP handler on EPOLLERR -- there's nothing to be done in that case and while at it: - restore the 20ms timer interval for periodic (TCP) events, I accidentally changed that to 100ms in an earlier commit - attempt using SO_ZEROCOPY for UDP -- if it's not available, sendmmsg() will succeed anyway - fix the handling of the status code from sendmmsg(), if it fails, we'll try to discard the first message, hence return 1 from the UDP handler Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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parent
962bc97cf1
commit
38b50dba47
10 changed files with 139 additions and 49 deletions
8
tcp.c
8
tcp.c
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@ -1003,6 +1003,11 @@ static void tcp_conn_from_sock(struct ctx *c, int fd)
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if (s == -1)
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return;
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if (s < c->tcp.fd_min)
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c->tcp.fd_min = s;
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if (s > c->tcp.fd_max)
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c->tcp.fd_max = s;
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if (sa_l.ss_family == AF_INET) {
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struct sockaddr_in *sa4 = (struct sockaddr_in *)&sa_r;
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@ -1445,6 +1450,9 @@ int tcp_sock_init(struct ctx *c)
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{
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in_port_t port;
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c->tcp.fd_min = INT_MAX;
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c->tcp.fd_max = 0;
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for (port = 0; port < (1 << 15) + (1 << 14); port++) {
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if (c->v4 && sock_l4_add(c, 4, IPPROTO_TCP, port) < 0)
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return -1;
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