[Devel] [PATCH RH7] fs/fuse kio: adjust rdma connection parameters

[Konstantin Khorenko]

Do we need it for vz9 as well?

--
Best regards,

Konstantin Khorenko,
Virtuozzo Linux Kernel Team

On 17.08.2023 17:45, Kui Liu wrote:
> In RoCE network, packet loss and dealy 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.
> 
> Signed-off-by: Liu Kui <Kui.Liu at acronis.com>
> 
> ---
> 
> 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,
> 
> --
> 
> 2.32.0 (Apple Git-132)
>