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

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Message-ID: <1505325534.15310.182.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 13 Sep 2017 10:58:54 -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 20:35 +0300, Denys Fedoryshchenko wrote:

> Overlimits never appear in HTB as i know, here is simulation on this 
> class that have constant "at least" 1G traffic, i throttled it to 1Kbit 
> to simulate forced drops:
> 
> shapernew ~ # sh /etc/shaper.cfg;sleep 1;tc -s -d class show dev 
> eth3.777 classid 1:111;tc qdisc del dev eth3.777 root
> class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 1Kbit 
> ceil 1Kbit linklayer ethernet burst 31280b/1 mpu 0b cburst 31280b/1 mpu 
> 0b level 0
>   Sent 134350019 bytes 117520 pkt (dropped 7819, overlimits 0 requeues 0)
>   backlog 7902126b 4976p requeues 0
>   lended: 86694 borrowed: 0 giants: 0
>   tokens: -937500000 ctokens: -937500000
> 

Oh right, I am using a local patch for this. Time to upstream :/