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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: Bob Peterson <rpeterso@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
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1 changed files with 9 additions and 1 deletions
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@ -63,6 +63,9 @@
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#define NEEDED_RMEM (4*1024*1024)
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#define CONN_HASH_SIZE 32
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/* Number of messages to send before rescheduling */
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#define MAX_SEND_MSG_COUNT 25
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struct cbuf {
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unsigned int base;
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unsigned int len;
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@ -1318,6 +1321,7 @@ static void send_to_sock(struct connection *con)
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const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
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struct writequeue_entry *e;
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int len, offset;
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int count = 0;
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mutex_lock(&con->sock_mutex);
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if (con->sock == NULL)
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@ -1355,8 +1359,12 @@ static void send_to_sock(struct connection *con)
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if (ret <= 0)
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goto send_error;
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}
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/* Don't starve people filling buffers */
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/* Don't starve people filling buffers */
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if (++count >= MAX_SEND_MSG_COUNT) {
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cond_resched();
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count = 0;
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}
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spin_lock(&con->writequeue_lock);
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e->offset += ret;
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