netdev - Re: [PATCH net-next] netem: add ECN capability

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Message-ID: <CAA93jw4sG9EYsM26vm-8cRf5GBGjAL3LDRR7FfPFdN7XT0P0jg@mail.gmail.com>
Date:	Tue, 1 May 2012 03:14:36 -0700
From:	Dave Taht <dave.taht@...il.com>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH net-next] netem: add ECN capability

On Tue, May 1, 2012 at 2:28 AM, Hagen Paul Pfeifer <hagen@...u.net> wrote:
> Nice!

Applause as well! While this is something of a fork of this
discussion, I would rather like to resurrect a variant of the old
'time in queue' patch...

http://patchwork.ozlabs.org/patch/125329/

As best as I recall we'd run into trouble with combining things like
netem and complex qdiscs, because we had basically overrun the size of
the control block.

And then there was a long discussion of all that and I forget if any
conclusion was reached.

An alternative to reducing the length of the control block was to find
some way to leverage this sanely in the qdisc layer...

#define HAVE_HW_TIME_STAMP

/**
 * struct skb_shared_hwtstamps - hardware time stamps
 * @hwtstamp:   hardware time stamp transformed into duration
 *              since arbitrary point in time
 * @syststamp:  hwtstamp transformed to system time base
 *

-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://www.bufferbloat.net
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