netdev - Re: HTB going crazy over ~5Gbit/s (4.12.9, but problem present in older kernels as well)

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Date:   Wed, 13 Sep 2017 10:20:22 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Denys Fedoryshchenko <nuclearcat@...learcat.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        netdev-owner@...r.kernel.org
Subject: Re: HTB going crazy over ~5Gbit/s (4.12.9, but problem present in
 older kernels as well)

On Wed, 2017-09-13 at 20:12 +0300, Denys Fedoryshchenko wrote:

> For my case, as load increased now, i am hitting same issue (i tried to 
> play with quantum / bursts as well, didnt helped):
> 
> tc -s -d class show dev eth3.777 classid 1:111;sleep 5;tc -s -d class 
> show dev eth3.777 classid 1:111
> class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 20Gbit 
> ceil 100Gbit linklayer ethernet burst 100000b/1 mpu 0b cburst 100000b/1 
> mpu 0b level 0
>   Sent 864151559 bytes 730566 pkt (dropped 15111, overlimits 0 requeues 
> 0)
>   backlog 73968000b 39934p requeues 0
>   lended: 499867 borrowed: 0 giants: 0
>   tokens: 608 ctokens: 121
> 

You have drops (and ~40,000 packets in backlog)


> class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 20Gbit 
> ceil 100Gbit linklayer ethernet burst 100000b/1 mpu 0b cburst 100000b/1 
> mpu 0b level 0
>   Sent 1469352160 bytes 1243649 pkt (dropped 42933, overlimits 0 requeues 
> 0)
>   backlog 82536047b 39963p requeues 0
>   lended: 810475 borrowed: 0 giants: 0
>   tokens: 612 ctokens: 122
> 
> (1469352160-864151559)/5*8
> 968320961.60000000000000000000
> Less than 1Gbit and it's being throttled

It is not : "overlimits 0"  means this class was not throttled.