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drbd: improve resync request throttling due to sendbuf size

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If we throttle resync because the socket sendbuffer is filling up,
tell TCP about it, so it may expand the sendbuffer for us.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2014-01-31 14:55:12 +01:00 committed by Philipp Reisner
parent 659b2e3bb8
commit 506afb6248
1 changed files with 14 additions and 9 deletions
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23
drivers/block/drbd/drbd_worker.c
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@ -592,7 +592,7 @@ static int make_resync_request(struct drbd_device *const device, int cancel)
const sector_t capacity = drbd_get_capacity(device->this_bdev);
int max_bio_size;
int number, rollback_i, size;
int align, queued, sndbuf;
int align, requeue = 0;
int i = 0;
if (unlikely(cancel))
@ -619,17 +619,22 @@ static int make_resync_request(struct drbd_device *const device, int cancel)
goto requeue;
for (i = 0; i < number; i++) {
/* Stop generating RS requests, when half of the send buffer is filled */
/* Stop generating RS requests when half of the send buffer is filled,
* but notify TCP that we'd like to have more space. */
mutex_lock(&connection->data.mutex);
if (connection->data.socket) {
queued = connection->data.socket->sk->sk_wmem_queued;
sndbuf = connection->data.socket->sk->sk_sndbuf;
} else {
queued = 1;
sndbuf = 0;
}
struct sock *sk = connection->data.socket->sk;
int queued = sk->sk_wmem_queued;
int sndbuf = sk->sk_sndbuf;
if (queued > sndbuf / 2) {
requeue = 1;
if (sk->sk_socket)
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
}
} else
requeue = 1;
mutex_unlock(&connection->data.mutex);
if (queued > sndbuf / 2)
if (requeue)
goto requeue;
next_sector: