[ovs-dev] [PATCH v4 0/5] Quicker pmd threads reloads

Ilya Maximets i.maximets at samsung.com
Wed Jul 10 09:03:48 UTC 2019


On 09.07.2019 19:19, 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 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):
> - cfc06fb13d9c: 141059/332512/6230137
> - patch1:       146114/279722/ 721557
> - patch2:        46118/176561/ 459963
> - patch3:        13878/124914/ 509629
> - patch4:        12980/157706/ 509447
> - patch5:        12945/ 17715/  45592
> 
> Changelog since v3:
> - explicitly do not wait for non pmd reload in patch 2
> - added Eelco acks
> 
> Changelog since v2:
> - remove unneeded synchronisation on pmd thread join in patch 2
> 
> Changelog since v1:
> - incorporated Ilya suggestions in patch 2 and 3
> - dropped previous acks on patch 2 and 3 but kept them on patch 4 and 5 since
>   there is no major change in them
> 
> Changelog since RFC v2:
> - added ack from Eelco
> 
> Changelog since RFC v1:
> - added numbers per patch in cover letter
> - added memory ordering for explicit synchronisations between threads
>   in patch 1 and patch 2
> 

For the series:
Acked-by: Ilya Maximets <i.maximets at samsung.com>


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