The commit is pushed to "branch-rh7-3.10.0-1160.95.1.vz7.210.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.95.1.vz7.210.1
------>
commit 6ffc75884e0b37e0c9efbc454c4ee20500a19fa9
Author: Kui Liu <kui....@acronis.com>
Date: Thu Aug 17 15:45:39 2023 +0000
fs/fuse kio: adjust rdma connection parameters - increase retry counts
In RoCE network, packet loss and delay due to congestion can happen
quite often. We need to tolerate such event. So increase retry_count
and rnr_retry_count to 7 to allow NIC to retry operations when an
error happens, instead of returning the error directly which causes
the connection to be aborted.
I believe 0 values mean no retry based on test. With both values as 0,
It kept receiving IBV_WC_RETRY_EXC_ERR for RDMA READ operations, which
aborts the connection. Changing to 7 (which I find to be commonly used
value in several examples from RDMA Core library), the error goes away
and we can at least have stable connection in such RoCE network.
Signed-off-by: Liu Kui <kui....@acronis.com>
Acked-by: Alexey Kuznetsov <kuz...@acronis.com>
Feature: vStorage
---
fs/fuse/kio/pcs/pcs_rdma_conn.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/fuse/kio/pcs/pcs_rdma_conn.c b/fs/fuse/kio/pcs/pcs_rdma_conn.c
index 4db903151de0..7339b1466d3a 100644
--- a/fs/fuse/kio/pcs/pcs_rdma_conn.c
+++ b/fs/fuse/kio/pcs/pcs_rdma_conn.c
@@ -44,8 +44,8 @@ conn_param_init(struct rdma_conn_param *cp, struct
pcs_rdmaio_conn_req *cr,
cp->initiator_depth = min_t(int, U8_MAX,
cmid->device->attrs.max_qp_init_rd_atom);
cp->flow_control = 1; /* does not matter */
- cp->retry_count = 0; /* # retransmissions when no ACK received
*/
- cp->rnr_retry_count = 0; /* # RNR retransmissions */
+ cp->retry_count = 7; /* # retransmissions when no ACK received
*/
+ cp->rnr_retry_count = 7; /* # RNR retransmissions */
}
static int pcs_rdma_cm_event_handler(struct rdma_cm_id *cmid,
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