Make sure the socket send buffer is at least 64KB. This reduces the number of

writev(2) system calls made for largish requests.  A similar change was made
to the libxtrans code a while ago.  This should speed up applications that
send images to the X server, like Firefox.  The seedupmight not be noticable
though.  But it reduces the noice in ktrace logs.

ok matthieu@

1 files changed, 7 insertions, 0 deletions

diff --git a/dist/libxcb/src/xcb_util.c b/dist/libxcb/src/xcb_util.c
index ba0f10867..a3357efde 100644
--- a/dist/libxcb/src/xcb_util.c
+++ b/dist/libxcb/src/xcb_util.c
@@ -428,6 +428,8 @@ static int _xcb_open_unix(char *protocol, const char *file)
 {
     int fd;
     struct sockaddr_un addr;
+    socklen_t len = sizeof(int);
+    int val;
 
     if (protocol && strcmp("unix",protocol))
         return -1;
@@ -440,6 +442,11 @@ static int _xcb_open_unix(char *protocol, const char *file)
     fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0);
     if(fd == -1)
         return -1;
+    if(getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0 && val < 64 * 1024)
+    {
+        val = 64 * 1024;
+        setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int));
+    }
     if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
         close(fd);
         return -1;