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Set TCP_NODELAY on P2P sockets.

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Nagle appears to be a significant contributor to latency now that the static
 sleeps are gone.  Most of our messages are relatively large compared to
 IP + TCP so I do not expect this to create enormous overhead.

This may also reduce traffic burstyness somewhat.
This commit is contained in:
Gregory Maxwell
2015-10-21 23:52:29 +00:00
parent 0fbfc5106c
commit a4e28b3d1e
3 changed files with 21 additions and 1 deletions
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12
src/net.cpp
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@@ -963,6 +963,15 @@ static void AcceptConnection(const ListenSocket& hListenSocket) {
return;
}
// According to the internet TCP_NODELAY is not carried into accepted sockets
// on all platforms. Set it again here just to be sure.
int set = 1;
#ifdef WIN32
setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
#else
setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
#endif
if (CNode::IsBanned(addr) && !whitelisted)
{
LogPrintf("connection from %s dropped (banned)\n", addr.ToString());
@@ -1790,8 +1799,11 @@ bool BindListenPort(const CService &addrBind, string& strError, bool fWhiteliste
// Allow binding if the port is still in TIME_WAIT state after
// the program was closed and restarted.
setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
// Disable Nagle's algorithm
setsockopt(hListenSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&nOne, sizeof(int));
#else
setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (const char*)&nOne, sizeof(int));
setsockopt(hListenSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&nOne, sizeof(int));
#endif
// Set to non-blocking, incoming connections will also inherit this