lib: nr_free_buffer_pages() with a large size

when the return value of nr_free_buffer_pages() is small, the default
socket buffer size of tcp socket (e.g., net.ipv4.tcp_rmem) never glows
and socket application can increase cwnd value. increaseing this buffer
pages solves this issue.

Signed-off-by: Hajime Tazaki <[email protected]>

Author: thehajime

arch/lib/fs.c

@@ -66,5 +66,5 @@ int dirtytime_interval_handler(struct ctl_table *table, int write,
 
 unsigned int nr_free_buffer_pages(void)
 {
-	return 1024;
+	return 65535;
 }