SUNRPC: RPC transport queue must be low latency
rpciod can easily get congested due to the long list of queued rpc_tasks.
Having the receive queue wait in turn for those tasks to complete can
therefore be a bottleneck.
Address the problem by separating the workqueues into:
- rpciod: manages rpc_tasks
- xprtiod: manages transport related work.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 62b4f5a..646170d 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1095,7 +1095,7 @@
if (xprt->reestablish_timeout)
xprt->reestablish_timeout = 0;
if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
- queue_work(rpciod_workqueue, &transport->recv_worker);
+ queue_work(xprtiod_workqueue, &transport->recv_worker);
}
read_unlock_bh(&sk->sk_callback_lock);
}
@@ -2378,7 +2378,7 @@
/* Start by resetting any existing state */
xs_reset_transport(transport);
- queue_delayed_work(rpciod_workqueue,
+ queue_delayed_work(xprtiod_workqueue,
&transport->connect_worker,
xprt->reestablish_timeout);
xprt->reestablish_timeout <<= 1;
@@ -2388,7 +2388,7 @@
xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
} else {
dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
- queue_delayed_work(rpciod_workqueue,
+ queue_delayed_work(xprtiod_workqueue,
&transport->connect_worker, 0);
}
}