On 12/5/23 10:10, Ales Musil wrote:
> Add unixctl command called "ofctrl/flow-install-time"
> that returns the last time it took OvS to process
> and install all flows. The initial time is taken right
> before controller queues the updates to rconn.
> The end is marked when we receive barrier reply with
> corresponding xid.
>
> Reported-at: https://issues.redhat.com/browse/FDP-134
> Signed-off-by: Ales Musil <amu...@redhat.com>
> ---
> controller/ofctrl.c | 31 +++++++++++++++++++++++++++++--
> 1 file changed, 29 insertions(+), 2 deletions(-)
Hi Ales,
Thanks for the patch!
This is supposed to be a rather "stable" command as the CMS wants to
rely on this to gather relevant load statistics. We should make sure we
document its behavior in ovn-controller.8.xml and mention it in the NEWS
file.
>
> diff --git a/controller/ofctrl.c b/controller/ofctrl.c
> index 7aac0128b..4f8b80012 100644
> --- a/controller/ofctrl.c
> +++ b/controller/ofctrl.c
> @@ -51,6 +51,7 @@
> #include "openvswitch/rconn.h"
> #include "socket-util.h"
> #include "timeval.h"
> +#include "unixctl.h"
> #include "util.h"
> #include "vswitch-idl.h"
>
> @@ -323,6 +324,7 @@ struct ofctrl_flow_update {
> struct ovs_list list_node; /* In 'flow_updates'. */
> ovs_be32 xid; /* OpenFlow transaction ID for barrier. */
> uint64_t req_cfg; /* Requested sequence number. */
> + long long start_msec; /* Timestamp when the update started. */
> };
>
> static struct ofctrl_flow_update *
> @@ -402,6 +404,10 @@ static enum mf_field_id mff_ovn_geneve;
> * (e.g. after OVS restart). */
> static bool ofctrl_initial_clear;
>
> +/* The time in ms it took for the last flow installation to be processed
> + * by OvS. */
> +static long long last_flow_install_time_ms = 0;
> +
> static ovs_be32 queue_msg(struct ofpbuf *);
>
> static struct ofpbuf *encode_flow_mod(struct ofputil_flow_mod *);
> @@ -413,6 +419,8 @@ static struct ofpbuf *encode_meter_mod(const struct
> ofputil_meter_mod *);
> static void ovn_installed_flow_table_clear(void);
> static void ovn_installed_flow_table_destroy(void);
>
> +static void flow_install_time_report(struct unixctl_conn *conn, int argc,
> + const char *argv[], void *param);
>
> static void ofctrl_recv(const struct ofp_header *, enum ofptype);
>
> @@ -429,6 +437,8 @@ ofctrl_init(struct ovn_extend_table *group_table,
> groups = group_table;
> meters = meter_table;
> shash_init(&meter_bands);
> + unixctl_command_register("ofctrl/flow-install-time", "", 0, 0,
> + flow_install_time_report, NULL);
> }
>
> /* S_NEW, for a new connection.
> @@ -732,6 +742,9 @@ recv_S_UPDATE_FLOWS(const struct ofp_header *oh, enum
> ofptype type,
> if (fup->req_cfg >= cur_cfg) {
> cur_cfg = fup->req_cfg;
> }
> +
> + last_flow_install_time_ms = time_msec() - fup->start_msec;
Nit: very unlikely but this can underflow.
Nit2: too many empty lines IMO. I'd just move this line immediately
before the "if (fup->req_cfg >= cur_cfg) {".
> +
> mem_stats.oflow_update_usage -= ofctrl_flow_update_size(fup);
> ovs_list_remove(&fup->list_node);
> free(fup);
> @@ -2900,6 +2913,7 @@ ofctrl_put(struct ovn_desired_flow_table *lflow_table,
> const struct ofp_header *oh = barrier->data;
> ovs_be32 xid_ = oh->xid;
> ovs_list_push_back(&msgs, &barrier->list_node);
> + long long flow_update_start = time_msec();
>
> /* Queue the messages. */
> struct ofpbuf *msg;
> @@ -2945,9 +2959,13 @@ ofctrl_put(struct ovn_desired_flow_table *lflow_table,
>
> /* Add a flow update. */
> fup = xmalloc(sizeof *fup);
> + *fup = (struct ofctrl_flow_update) {
> + .xid = xid_,
> + .req_cfg = req_cfg,
> + .start_msec = flow_update_start,
> + };
> +
> ovs_list_push_back(&flow_updates, &fup->list_node);
> - fup->xid = xid_;
> - fup->req_cfg = req_cfg;
> mem_stats.oflow_update_usage += ofctrl_flow_update_size(fup);
> done:;
> } else if (!ovs_list_is_empty(&flow_updates)) {
> @@ -3090,3 +3108,12 @@ ofctrl_get_memory_usage(struct simap *usage)
> ROUND_UP(rconn_packet_counter_n_bytes(tx_counter), 1024)
> / 1024);
> }
> +
> +static void
> +flow_install_time_report(struct unixctl_conn *conn, int argc OVS_UNUSED,
> + const char *argv[] OVS_UNUSED, void *param
> OVS_UNUSED)
> +{
> + char *msg = xasprintf("%lld ms", last_flow_install_time_ms);
> + unixctl_command_reply(conn, msg);
> + free(msg);
> +}
Thanks,
Dumitru
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