libceph: tcp_nodelay support
TCP_NODELAY socket option set on connection sockets,
disables Nagle’s algorithm and improves latency characteristics.
tcp_nodelay(default)/notcp_nodelay option flags provided to
enable/disable setting the socket option.
Signed-off-by: Chaitanya Huilgol <chaitanya.huilgol@sandisk.com>
[idryomov@redhat.com: NO_TCP_NODELAY -> TCP_NODELAY, minor adjustments]
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 8b11a79..16fff96 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -30,8 +30,9 @@
#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
#define CEPH_OPT_NOMSGAUTH (1<<4) /* not require cephx message signature */
+#define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
-#define CEPH_OPT_DEFAULT (0)
+#define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
#define ceph_set_opt(client, opt) \
(client)->options->flags |= CEPH_OPT_##opt;
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index d9d396c..e154994 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -57,6 +57,7 @@
atomic_t stopping;
bool nocrc;
+ bool tcp_nodelay;
/*
* the global_seq counts connections i (attempt to) initiate
@@ -264,7 +265,8 @@
struct ceph_entity_addr *myaddr,
u64 supported_features,
u64 required_features,
- bool nocrc);
+ bool nocrc,
+ bool tcp_nodelay);
extern void ceph_con_init(struct ceph_connection *con, void *private,
const struct ceph_connection_operations *ops,