[ovs-dev] [RFC v2 0/5] Quicker pmd threads reloads

[Kevin Traynor]

On 14/05/2019 17:33, David Marchand wrote:
> We have been testing the rebalance code in different situations while
> having traffic going through OVS.
> Those tests have shown that part of the observed packets losses is due to
> some time wasted in signaling/waiting for the pmd threads to reload their
> polling configurations.
> 
> This RFC series is an attempt at getting pmd threads reloads quicker and
> more deterministic.
> 
> Example of number of cycles spent by a pmd between two polling
> configurations (in cycles minimum/average/maximum of 1000 changes):
> - d58b59c17c70: 126822/312103/756580
> - patch1:       113658/296157/741688
> - patch2:        49198/167206/466108
> - patch3:        13032/120730/341163
> - patch4:        12803/112964/323455
> - patch5:        13633/ 20373/ 47410
> 
> Changelog since v1:
> - added numbers per patch in cover letter
> - added memory ordering for explicit synchronisations between threads
>   in patch 1 and patch 2
> 

Aside from the couple of very minor comments, the series LGTM