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Code Issues Releases Wiki Activity

For #307, refine the GSO for performance

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This commit is contained in:
winlin 2020-04-17 07:58:11 +08:00
parent 21ede1f084
commit acc471b0a9
1 changed files with 21 additions and 20 deletions
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41
trunk/src/app/srs_app_rtc_conn.cpp
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@ -940,6 +940,8 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsRtcPackets& packets)
mmsghdr* gso_mhdr = NULL; int gso_size = 0; int gso_encrypt = 0; int gso_cursor = 0;
// GSO, N packets has same length, the final one may not.
bool using_gso = false; bool gso_final = false;
// The message will marshal in iovec.
iovec* iov = NULL;
int nn_packets = packets.size();
for (int i = 0; i < nn_packets; i++) {
@ -986,28 +988,25 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsRtcPackets& packets)
}
// Check whether we can use GSO to send it.
mmsghdr* mhdr = NULL;
if ((gso_size && gso_size == nn_packet) || (using_gso && !gso_final)) {
using_gso = true;
gso_final = (gso_size && gso_size != nn_packet);
mhdr = gso_mhdr;
if (using_gso && !gso_final) {
gso_final = (gso_size != nn_packet);
}
// Change the state according to the next packet.
if (next_packet) {
// If GSO, but next is bigger than this one, we must enter the final state.
if (using_gso && !gso_final) {
gso_final = (nn_packet < nn_next_packet);
}
// If not GSO, maybe the first fresh packet, we should see whether the next packet is smaller than this one,
// if smaller, we can still enter GSO.
if (!using_gso) {
using_gso = (nn_packet >= nn_next_packet);
}
// If GSO, but next is bigger than this one, we must enter the final state.
if (using_gso && !gso_final) {
gso_final = (nn_packet < nn_next_packet);
}
}
// Now, we fetch the msg from cache.
// For GSO, reuse mhdr if possible.
mmsghdr* mhdr = gso_mhdr;
if (!mhdr) {
// Fetch a cached message from queue.
// TODO: FIXME: Maybe encrypt in async, so the state of mhdr maybe not ready.
@ -1016,18 +1015,20 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsRtcPackets& packets)
}
// Now, GSO will use this message and size.
if (using_gso) {
gso_mhdr = mhdr;
gso_size = nn_packet;
}
gso_mhdr = mhdr;
gso_size = nn_packet;
}
// For this message, select a new iovec.
iovec* iov = mhdr->msg_hdr.msg_iov + gso_cursor;
mhdr->msg_hdr.msg_iovlen = gso_cursor + 1;
if (!iov) {
iov = mhdr->msg_hdr.msg_iov;
} else {
iov++;
}
gso_cursor++;
mhdr->msg_hdr.msg_iovlen = gso_cursor;
if (!iov->iov_base) {
if (gso_cursor > SRS_PERF_RTC_GSO_IOVS && !iov->iov_base) {
iov->iov_base = new char[kRtpPacketSize];
}
iov->iov_len = kRtpPacketSize;
@ -1113,7 +1114,7 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsRtcPackets& packets)
// Reset the GSO flag.
gso_mhdr = NULL; gso_size = 0; gso_encrypt = 0; gso_cursor = 0;
using_gso = gso_final = false;
using_gso = gso_final = false; iov = NULL;
}
}