linux-kernel - Re: [PATCH 1/2] Traffic control cgroups subsystem

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Message-ID: <6599ad830809101653p5688d9b8xad0772af875a92e4@mail.gmail.com>
Date:	Wed, 10 Sep 2008 16:53:16 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Thomas Graf" <tgraf@...g.ch>
Cc:	"Ranjit Manomohan" <ranjitm@...gle.com>, davem@...emloft.net,
	akpm@...ux-foundation.org, kaber@...sh.net, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] Traffic control cgroups subsystem

On Wed, Sep 10, 2008 at 4:45 PM, Thomas Graf <tgraf@...g.ch> wrote:
>
> That's argueable I guess. Likely or not, it doesn't make sense to
> add such restrictions if not required, especially not when it is
> trivial to just look at the cgroup of the task directly.

Isn't a very large fraction of outgoing network traffic driven from
net_tx_action(), which doesn't execute in the context of the sending
process? Or am I missing something?

You claimed "In the most common case, the packet is not queued before
it hits the qdisc so this takes away a lot of complexity and is very
fast but should still be sufficient.". But is that really true on a
system where the network is busy? (Which is after all exactly the case
where you care about accurate traffic accounting/policing)

Paul
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