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: <9b8cdc2b39fdd2d0be7b5f559b2034e7@nuclearcat.com>
Date:   Wed, 13 Sep 2017 19:27:22 +0300
From:   Denys Fedoryshchenko <nuclearcat@...learcat.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: HTB going crazy over ~5Gbit/s (4.12.9, but problem present in
 older kernels as well)

On 2017-09-13 19:16, Eric Dumazet wrote:
> On Wed, 2017-09-13 at 18:34 +0300, Denys Fedoryshchenko wrote:
>> Well, probably i am answering my own question, removing estimator from
>> classes seems drastically improve situation.
>> It seems estimator has some issues that cause shaper to behave
>> incorrectly (throttling traffic while it should not).
>> But i guess thats a bug?
>> As i was not able to predict such bottleneck by CPU load measurements.
> 
> Well, there was a reason we disabled HTB class estimators by default ;)
> 
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=64153ce0a7b61b2a5cacb01805cbf670142339e9

As soon as disabling it solve my problem - i'm fine, hehe, but i guess 
other people who might hit this problem, should be aware how to find 
reason.
They should not be disappointed in Linux :)
Because i can't measure this bottleneck before it happens, i'm seeing on 
mpstat all cpu's are idle, and same time traffic is throttled.