staging: lustre: at: net AT after connect

Once connected, the previously gathered AT statistics is not valid
anymore because may reflect other routing, etc. The connect by itself
could take a long time due to different reasons (e.g. server was not
ready) and net latency got very high (see import_select_connection())
what does not reflect the current situation.

Take into account only the current (re-)CONNECT rpc latency.

Signed-off-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5380
Xyratex-bug-id: MRP-1285
Reviewed-on: http://review.whamcloud.com/11155
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/ptlrpc/client.c b/drivers/staging/lustre/lustre/ptlrpc/client.c
index bea1c16..27fe00d 100644 (file)
--- a/drivers/staging/lustre/lustre/ptlrpc/client.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/client.c
@@ -283,8 +283,8 @@ int ptlrpc_at_get_net_latency(struct ptlrpc_request *req)
 }
 
 /* Adjust expected network latency */
-static void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
-                                     unsigned int service_time)
+void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
+                              unsigned int service_time)
 {
        unsigned int nl, oldnl;
        struct imp_at *at;

diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index 013a957..17f3fec 100644 (file)
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -846,6 +846,14 @@ static int ptlrpc_connect_interpret(const struct lu_env *env,
        imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
        class_export_put(exp);
 
+       /*
+        * The net statistics after (re-)connect is not valid anymore,
+        * because may reflect other routing, etc.
+        */
+       at_init(&imp->imp_at.iat_net_latency, 0, 0);
+       ptlrpc_at_adj_net_latency(request,
+                                 lustre_msg_get_service_time(request->rq_repmsg));
+
        obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 
        if (aa->pcaa_initial_connect) {

diff --git a/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h b/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
index a9831fa..29cfac2 100644 (file)
--- a/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
+++ b/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
@@ -53,6 +53,8 @@ int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait);
 int ptlrpcd_start(struct ptlrpcd_ctl *pc);
 
 /* client.c */
+void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
+                              unsigned int service_time);
 struct ptlrpc_bulk_desc *ptlrpc_new_bulk(unsigned npages, unsigned max_brw,
                                         unsigned type, unsigned portal);
 int ptlrpc_request_cache_init(void);