Hi VPP-developers,
Please share your ideas about averaging window.
Thanks,
Athilakshmi S
On Mon, Jun 14, 2021 at 8:51 PM meera s via lists.fd.io <athi2812=
gmail....@lists.fd.io> wrote:
> Hi All,
>
>
>
> We are trying to implement the averaging window associated with QoS flows
> in VPP - 21.06
>
> We found that HQoS implementation in dpdk plugin, has tc_period
> calculation, but deprecated from vpp.
>
>
>
> The following policer was configured
>
> configure policer name policer_avg type 1r2c cir 450 cb 5120000 rate kbps
> conform-action mark-and-transmit CS4 exceed-action drop
>
>
>
> Following traces were added and observed with one ingress packet
>
>
>
> DBGvpp# At vnet_police_packet time -> 80082589943
>
> packet_length = packet_length << policer->scale -> 56320
>
> n_periods = time - policer->last_update_time -> 80082589943
>
> policer->last_update_time = time -> 80082589943
>
> current_tokens=policer->current_bucket + n_periods *
> policer->cir_tokens_per_period -> 131418151536463
>
> current_tokens = policer->current_limit -> 2621440000
>
> extended_tokens = policer->extended_bucket + n_periods *
> policer->cir_tokens_per_period -> 131415530096463
>
> extended_tokens = policer->extended_limit -> 0
>
> IF current_tokens >= packet_length 2621440000 -> 56320
>
> policer->current_bucket = current_tokens - packet_length -> 2621383680
>
> policer->extended_bucket = extended_tokens - packet_length -> 4294910976
>
>
>
> From the above added traces, our understanding is
>
>
>
> "n_periods is the variable used for averaging window." Is our
> understanding correct.
>
> Could you please let us know the usage of last_update_time in policer_t.
>
>
>
> Below code snippet is seen in HQoS, however deprecated in latest VPP.
>
>
>
> @param tc_period - enforcement period for rates (measured in milliseconds)
>
>
>
> define sw_interface_set_dpdk_hqos_subport {
>
> u32 client_index;
>
> u32 context;
>
> u32 sw_if_index;
>
> u32 subport;
>
> u32 tb_rate;
>
> u32 tb_size;
>
> u32 tc_rate[4];
>
> u32 tc_period;
>
> };
>
>
>
> Does tc_period computes the averaging window?
>
> If so, what is the equivalent to tc_period as in HQoS?
>
>
>
> Kindly let us know if Averaging window concept is handled in current code,
> or share your view in handling it in VPP.
>
>
>
>
>
> Thanks and regards,
>
> Athilakshmi S
>
>
>
>
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