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Commit f92c8dd7 authored by Bob Peterson's avatar Bob Peterson Committed by David Teigland
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dlm: reduce cond_resched during send 



Calling cond_resched() after every send can unnecessarily
degrade performance.  Go back to an old method of scheduling
after 25 messages.

Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
parent cb2d45da

fs/dlm/lowcomms.c

+9 −1
Original line number Diff line number Diff line
@@ -63,6 +63,9 @@ 
#define NEEDED_RMEM (4*1024*1024)

#define CONN_HASH_SIZE 32



/* Number of messages to send before rescheduling */

#define MAX_SEND_MSG_COUNT 25



struct cbuf {

	unsigned int base;

	unsigned int len;
@@ -1318,6 +1321,7 @@ static void send_to_sock(struct connection *con) 
	const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;

	struct writequeue_entry *e;

	int len, offset;

	int count = 0;



	mutex_lock(&con->sock_mutex);

	if (con->sock == NULL)
@@ -1355,8 +1359,12 @@ static void send_to_sock(struct connection *con) 
			if (ret <= 0)

				goto send_error;

		}



		/* Don't starve people filling buffers */

		if (++count >= MAX_SEND_MSG_COUNT) {

			cond_resched();

			count = 0;

		}



		spin_lock(&con->writequeue_lock);

		e->offset += ret;