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tipc: decrease connection flow control window 

Memory overhead when allocating big buffers for data transfer may
be quite significant. E.g., truesize of a 64 KB buffer turns out
to be 132 KB, 2 x the requested size.

This invalidates the "worst case" calculation we have been
using to determine the default socket receive buffer limit,
which is based on the assumption that 1024x64KB = 67MB buffers
may be queued up on a socket.

Since TIPC connections cannot survive hitting the buffer limit,
we have to compensate for this overhead.

We do that in this commit by dividing the fix connection flow
control window from 1024 (2*512) messages to 512 (2*256). Since
older version nodes send out acks at 512 message intervals,
compatibility with such nodes is guaranteed, although performance
may be non-optimal in such cases.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2014-05-14 05:39:08 -04:00 committed by David S. Miller
parent 3fdddd859a
commit 6163a194e0
3 changed files with 11 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/tipc/core.c
View File

@ -154,10 +154,11 @@ static int __init tipc_init(void)
tipc_max_ports = CONFIG_TIPC_PORTS;
tipc_net_id = 4711;
sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;
sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<
sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
TIPC_LOW_IMPORTANCE;
sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
TIPC_CRITICAL_IMPORTANCE;
sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT;
sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT;
res = tipc_core_start();
if (res)

9
net/tipc/port.h
View File

@ -42,9 +42,10 @@
#include "msg.h"
#include "node_subscr.h"
#define TIPC_FLOW_CONTROL_WIN 512
#define CONN_OVERLOAD_LIMIT ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
#define TIPC_CONNACK_INTV 256
#define TIPC_FLOWCTRL_WIN (TIPC_CONNACK_INTV * 2)
#define TIPC_CONN_OVERLOAD_LIMIT ((TIPC_FLOWCTRL_WIN * 2 + 1) * \
SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
/**
* struct tipc_port - TIPC port structure
@ -187,7 +188,7 @@ static inline void tipc_port_unlock(struct tipc_port *p_ptr)
static inline int tipc_port_congested(struct tipc_port *p_ptr)
{
return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
return ((p_ptr->sent - p_ptr->acked) >= TIPC_FLOWCTRL_WIN);
}

4
net/tipc/socket.c
View File

@ -1101,7 +1101,7 @@ restart:
/* Consume received message (optional) */
if (likely(!(flags & MSG_PEEK))) {
if ((sock->state != SS_READY) &&
(++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
(++port->conn_unacked >= TIPC_CONNACK_INTV))
tipc_acknowledge(port->ref, port->conn_unacked);
advance_rx_queue(sk);
}
@ -1210,7 +1210,7 @@ restart:
/* Consume received message (optional) */
if (likely(!(flags & MSG_PEEK))) {
if (unlikely(++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
if (unlikely(++port->conn_unacked >= TIPC_CONNACK_INTV))
tipc_acknowledge(port->ref, port->conn_unacked);
advance_rx_queue(sk);
}