Subject: Re: [PATCH net-next 0/8] net: sched: pie: align PIE implementation with RFC 8033

From: Stephen Hemminger <[email-masked]>
Date: Wed, 31 Oct 2018 09:36:34 -0700

On Wed, 31 Oct 2018 21:49:24 +0530
Leslie Monis <[email-masked]> wrote:

> The current implementation of PIE queueing discipline is according to an IETF
> draft [http://tools.ietf.org/html/draft-pan-aqm-pie-00] and the paper
> [PIE: A Lightweight Control Scheme to Address the Bufferbloat Problem].
> However, a lot of necessary modifications and enhancements have been proposed
> in RFC 8033, which have not yet been incorporated in the source code of Linux
> kernel. The following series of patches helps in achieving the same.
> 
> This patch series includes:
> 
> 1. Change the value of QUEUE_THRESHOLD
> 2. Change the default value of pie_params->target
> 3. Change the default value of pie_params->tupdate
> 4. Change the initial value of pie_vars->burst_time
> 5. Add more conditions to auto-tune alpha and beta
> 6. Add mechanism to set PIE active/inactive
> 7. Add a derandomization mechanism
> 8. Update references
> 
> Mohit P. Tahiliani (8):
>   net: sched: pie: change value of QUEUE_THRESHOLD
>   net: sched: pie: change default value of pie_params->target
>   net: sched: pie: change default value of pie_params->tupdate
>   net: sched: pie: change initial value of pie_vars->burst_time
>   net: sched: pie: add more conditions to auto-tune alpha and beta
>   net: sched: pie: add mechanism to set PIE active/inactive
>   net: sched: pie: add derandomization mechanism
>   net: sched: pie: update references
> 
>  net/sched/sch_pie.c | 77 +++++++++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 63 insertions(+), 14 deletions(-)
> 

Did you do performance tests? Often the RFC is out of date and
the actual values are better than those in the standard.