netdev - Re: [PATCH iproute2] tc: fq: support low_rate

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Message-ID: <20170920175305.105544f7@xeon-e3>
Date:   Wed, 20 Sep 2017 17:53:05 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Neal Cardwell <ncardwell@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH iproute2] tc: fq: support low_rate_threshold attribute

On Fri, 08 Sep 2017 14:12:59 -0700
Eric Dumazet <eric.dumazet@...il.com> wrote:

> From: Eric Dumazet <edumazet@...gle.com>
> 
> TCA_FQ_LOW_RATE_THRESHOLD sch_fq attribute was added in linux-4.9
> 
> Tested:
> 
> lpaa5:/tmp# tc -qd add dev eth1 root fq
> lpaa5:/tmp# tc -s qd sh dev eth1
> qdisc fq 8003: root refcnt 5 limit 10000p flow_limit 1000p buckets 4096 \
>  orphan_mask 4095 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 quantum 3648 \
>  initial_quantum 18240 low_rate_threshold 550Kbit refill_delay 40.0ms
>  Sent 62139 bytes 395 pkt (dropped 0, overlimits 0 requeues 0)
>  backlog 0b 0p requeues 0
>   116 flows (114 inactive, 0 throttled)
>   1 gc, 0 highprio, 0 throttled
>     
> lpaa5:/tmp# ./netperf -H lpaa6 -t TCP_RR -l10 -- -q 500000 -r 300,300 -o P99_LATENCY
> 99th Percentile Latency Microseconds
> 7081
>     
> lpaa5:/tmp# tc qd replace dev eth1 root fq low_rate_threshold 10Mbit
> lpaa5:/tmp# ./netperf -H lpaa6 -t TCP_RR -l10 -- -q 500000 -r 300,300 -o P99_LATENCY
> 99th Percentile Latency Microseconds
> 858
> 
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied