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libceph: don't time out osd requests that haven't been received 

Keep track of when an outgoing message is ACKed (i.e., the server fully
received it and, presumably, queued it for processing).  Time out OSD
requests only if it's been too long since they've been received.

This prevents timeouts and connection thrashing when the OSDs are simply
busy and are throttling the requests they read off the network.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-07-26 11:27:24 -07:00
parent 8f04d42276
commit 4cf9d54463
3 changed files with 12 additions and 7 deletions
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1
include/linux/ceph/messenger.h
View File

@ -94,6 +94,7 @@ struct ceph_msg {
bool more_to_follow;
bool needs_out_seq;
int front_max;
unsigned long ack_stamp; /* tx: when we were acked */
struct ceph_msgpool *pool;
};

12
net/ceph/messenger.c
View File

@ -486,13 +486,10 @@ static void prepare_write_message(struct ceph_connection *con)
m = list_first_entry(&con->out_queue,
struct ceph_msg, list_head);
con->out_msg = m;
if (test_bit(LOSSYTX, &con->state)) {
list_del_init(&m->list_head);
} else {
/* put message on sent list */
ceph_msg_get(m);
list_move_tail(&m->list_head, &con->out_sent);
}
/* put message on sent list */
ceph_msg_get(m);
list_move_tail(&m->list_head, &con->out_sent);
/*
* only assign outgoing seq # if we haven't sent this message
@ -1399,6 +1396,7 @@ static void process_ack(struct ceph_connection *con)
break;
dout("got ack for seq %llu type %d at %p\n", seq,
le16_to_cpu(m->hdr.type), m);
m->ack_stamp = jiffies;
ceph_msg_remove(m);
}
prepare_read_tag(con);

6
net/ceph/osd_client.c
View File

@ -1085,9 +1085,15 @@ static void handle_timeout(struct work_struct *work)
req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
r_req_lru_item);
/* hasn't been long enough since we sent it? */
if (time_before(jiffies, req->r_stamp + timeout))
break;
/* hasn't been long enough since it was acked? */
if (req->r_request->ack_stamp == 0 ||
time_before(jiffies, req->r_request->ack_stamp + timeout))
break;
BUG_ON(req == last_req && req->r_stamp == last_stamp);
last_req = req;
last_stamp = req->r_stamp;