Some payload sizes/patterns stand to gain performance benefits by
tuning the size of the TCP socket buffers, so this commit adds
module parameters to customize those values when desired.
Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
---
net/rds/tcp.c | 16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletions(-)
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index ad60299..b59e7a2 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -52,7 +52,13 @@ static LIST_HEAD(rds_tcp_conn_list);
static struct kmem_cache *rds_tcp_conn_slab;
-#define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
+static int sndbuf_size = 16384;
+module_param(sndbuf_size, int, 0444);
+MODULE_PARM_DESC(sndbuf_size, "SO_SNDBUF size of kernel tcp socket");
+
+static int rcvbuf_size = 87380;
+module_param(rcvbuf_size, int, 0444);
+MODULE_PARM_DESC(rcvbuf_size, "SO_RCVBUF size of kernel tcp socket");
/* doing it this way avoids calling tcp_sk() */
void rds_tcp_nonagle(struct socket *sock)
@@ -72,7 +78,15 @@ void rds_tcp_nonagle(struct socket *sock)
*/
void rds_tcp_tune(struct socket *sock)
{
+ struct sock *sk = sock->sk;
+
rds_tcp_nonagle(sock);
+
+ lock_sock(sk);
+ sk->sk_sndbuf = sndbuf_size;
+ sk->sk_rcvbuf = rcvbuf_size;
+ sk->sk_userlocks |= SOCK_SNDBUF_LOCK | SOCK_RCVBUF_LOCK;
+ release_sock(sk);
}
u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
--
1.7.1
