From: "Holger Hoffstätte" <holger@applied-asynchrony.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Netdev <netdev@vger.kernel.org>
Subject: Re: Default qdisc not correctly initialized with custom MTU
Date: Tue, 10 Sep 2019 19:45:37 +0200 [thread overview]
Message-ID: <928db740-b80d-02d5-5846-5d34ea709579@applied-asynchrony.com> (raw)
In-Reply-To: <CAM_iQpUO3vedg+XOcMb8s6hE=+hdvjPJp9DitjHZE6oNtDVkVQ@mail.gmail.com>
On 9/10/19 6:56 PM, Cong Wang wrote:
> It is _not_ created when sysctl is configured, it is either created via tc
> command, or implicitly created by kernel when you bring up eth0.
> sysctl only tells kernel what to create by default, but never commits it.
Ok, thank you - that's good to know, because it means there is something
wrong with how my interface is initially brought up. And indeed I found
the problem: my startup scripts apparently bring up the interface twice -
once to "pre-start" (load/verify modules etc.) and then again after
applying mtu/route/etc. settings. Obviously without MTU bringing up the
interface will pull in the default qdisc in the interface's default config,
and that's what I saw after boot. Weird but what can I say.
Anyway, thanks for trying to help. :)
Holger
prev parent reply other threads:[~2019-09-10 17:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-08 14:13 Default qdisc not correctly initialized with custom MTU Holger Hoffstätte
2019-09-09 22:52 ` Cong Wang
2019-09-10 9:14 ` Holger Hoffstätte
2019-09-10 16:56 ` Cong Wang
2019-09-10 17:45 ` Holger Hoffstätte [this message]
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