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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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9
src/netbase.cpp
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@ -444,12 +444,19 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
if (hSocket == INVALID_SOCKET)
return false;
#ifdef SO_NOSIGPIPE
int set = 1;
#ifdef SO_NOSIGPIPE
// Different way of disabling SIGPIPE on BSD
setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
#endif
//Disable Nagle's algorithm
#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
// Set to non-blocking
if (!SetSocketNonBlocking(hSocket, true))
return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));