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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-10-03 14:03:59 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-10-03 14:22:45 -0700 |
| commit | 9e20ae339721d614a1b0768c48bd73b456ff7905 (patch) | |
| tree | 92a35dda9c5676327bfbff4ee6462da05026a480 | |
| parent | f56cbbb4b5871e5bc2838ddeeba5b29debc2a734 (diff) | |
| download | linux-stable-9e20ae339721d614a1b0768c48bd73b456ff7905.tar.gz linux-stable-9e20ae339721d614a1b0768c48bd73b456ff7905.tar.bz2 linux-stable-9e20ae339721d614a1b0768c48bd73b456ff7905.zip | |
iscsi-target; Allow an extra tag_num / 2 number of percpu_ida tags
This patch bumps the default number of tags allocated per session by
iscsi-target via transport_alloc_session_tags() -> percpu_ida_init()
by another (tag_num / 2).
This is done to take into account the tags waiting to be acknowledged
and released in iscsit_ack_from_expstatsn(), but who's number are not
directly limited by the CmdSN Window queue_depth being enforced by
the target.
Using a larger value here is also useful to prevent percpu_ida_alloc()
from having to steal tags from other CPUs when no tags are available
on the local CPU, while waiting for unacknowledged tags to be released.
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/target/iscsi/iscsi_target_nego.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c index 14d1aed5af1d..ef6d836a4d09 100644 --- a/drivers/target/iscsi/iscsi_target_nego.c +++ b/drivers/target/iscsi/iscsi_target_nego.c @@ -1192,7 +1192,7 @@ get_target: */ alloc_tags: tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); - tag_num += ISCSIT_EXTRA_TAGS; + tag_num += (tag_num / 2) + ISCSIT_EXTRA_TAGS; tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); |