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

[Eelco Chaudron]

David this patch set looks fine by me, guess a none-RFC patch would be 
next?

Acked-by: Eelco Chaudron <echaudro at redhat.com>

On 14 May 2019, at 18:33, 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
>
> -- 
> David Marchand
>
> David Marchand (5):
>   dpif-netdev: Convert exit latch to flag.
>   dpif-netdev: Trigger parallel pmd reloads.
>   dpif-netdev: Do not sleep when swapping queues.
>   dpif-netdev: Only reload static tx qid when needed.
>   dpif-netdev: Catch reloads faster.
>
>  lib/dpif-netdev.c | 131 
> +++++++++++++++++++++++++++++++++++++++++-------------
>  1 file changed, 100 insertions(+), 31 deletions(-)
>
> -- 
> 1.8.3.1