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authorLudovic Courtès <ludovic.courtes@inria.fr>2017-06-22 10:56:18 +0200
committerLudovic Courtès <ludo@gnu.org>2017-06-22 10:59:07 +0200
commit6efb578a1412bae959dd6b1755e2c333eb4e4cd8 (patch)
tree78528ca55abbbacf633731e0b93640cc462a44e6 /nix
parent1071f781d97509347144754b3248581cf7c6c1d5 (diff)
daemon: Set TCP_NODELAY and TCP_QUICKACK on remote sockets.
* nix/nix-daemon/nix-daemon.cc (acceptConnection): Set TCP_NODELAY and TCP_QUICKACK on REMOTE.
Diffstat (limited to 'nix')
-rw-r--r--nix/nix-daemon/nix-daemon.cc18
1 files changed, 18 insertions, 0 deletions
diff --git a/nix/nix-daemon/nix-daemon.cc b/nix/nix-daemon/nix-daemon.cc
index 3d8e909901..b20225b3b0 100644
--- a/nix/nix-daemon/nix-daemon.cc
+++ b/nix/nix-daemon/nix-daemon.cc
@@ -19,6 +19,9 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
#include <fcntl.h>
#include <errno.h>
#include <pwd.h>
@@ -839,6 +842,21 @@ static void acceptConnection(int fdSocket)
closeOnExec(remote);
+ {
+ int enabled = 1;
+
+ /* If we're on a TCP connection, disable Nagle's algorithm so that
+ data is sent as soon as possible. */
+ (void) setsockopt(remote, SOL_TCP, TCP_NODELAY,
+ &enabled, sizeof enabled);
+
+#if defined(TCP_QUICKACK)
+ /* Enable TCP quick-ack if applicable; this might help a little. */
+ (void) setsockopt(remote, SOL_TCP, TCP_QUICKACK,
+ &enabled, sizeof enabled);
+#endif
+ }
+
pid_t clientPid = -1;
bool trusted = false;