[dpdk-dev] [PATCH v4] lib/librte_meter: add meter configuration profile
Thomas Monjalon
thomas at monjalon.net
Mon Feb 19 22:12:15 CET 2018
08/01/2018 16:43, Jasvinder Singh:
> From: Cristian Dumitrescu <cristian.dumitrescu at intel.com>
>
> This patch adds support for meter configuration profiles.
> Benefits: simplified configuration procedure, improved performance.
>
> Q1: What is the configuration profile and why does it make sense?
> A1: The configuration profile represents the set of configuration
> parameters for a given meter object, such as the rates and sizes for
> the token buckets. The configuration profile concept makes sense when
> many meter objects share the same configuration, which is the typical
> usage model: thousands of traffic flows are each individually metered
> according to just a few service levels (i.e. profiles).
>
> Q2: How is the configuration profile improving the performance?
> A2: The performance improvement is achieved by reducing the memory
> footprint of a meter object, which results in better cache utilization
> for the typical case when large arrays of meter objects are used. The
> internal data structures stored for each meter object contain:
> a) Constant fields: Low level translation of the configuration
> parameters that does not change post-configuration. This is
> really duplicated for all meters that use the same
> configuration. This is the configuration profile data that is
> moved away from the meter object. Current size (implementation
> dependent): srTCM = 32 bytes, trTCM = 32 bytes.
> b) Variable fields: Time stamps and running counters that change
> during the on-going traffic metering process. Current size
> (implementation dependant): srTCM = 24 bytes, trTCM = 32 bytes.
> Therefore, by moving the constant fields to a separate profile
> data structure shared by all the meters with the same
> configuration, the size of the meter object is reduced by ~50%.
>
> Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu at intel.com>
> Signed-off-by: Jasvinder Singh <jasvinder.singh at intel.com>
Applied for 18.05 (was postponed to preserve 18.02 ABI), thanks.
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