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authorChuck Lever <chuck.lever@oracle.com>2019-01-09 10:04:57 -0500
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-01-15 15:36:41 -0500
commitdeaa5c96c2f7e8b934088a1e70a0fe8797bd1149 (patch)
parent97b78ae96ba76f4ca2d8f5afee6a2e567ccb8f45 (diff)
SUNRPC: Address Kerberos performance/behavior regression
When using Kerberos with v4.20, I've observed frequent connection loss on heavy workloads. I traced it down to the client underrunning the GSS sequence number window -- NFS servers are required to drop the RPC with the low sequence number, and also drop the connection to signal that an RPC was dropped. Bisected to commit 918f3c1fe83c ("SUNRPC: Improve latency for interactive tasks"). I've got a one-line workaround for this issue, which is easy to backport to v4.20 while a more permanent solution is being derived. Essentially, tk_owner-based sorting is disabled for RPCs that carry a GSS sequence number. Fixes: 918f3c1fe83c ("SUNRPC: Improve latency for interactive ... ") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 9075ae150ae5..f1ec2110efeb 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1178,7 +1178,7 @@ xprt_request_enqueue_transmit(struct rpc_task *task)
goto out;
- } else {
+ } else if (!req->rq_seqno) {
list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) {
if (pos->rq_task->tk_owner != task->tk_owner)