From: Stephen Hemminger <shemminger@vyatta•com>
To: "David Laight" <David.Laight@ACULAB•COM>
Cc: "Hagen Paul Pfeifer" <hagen@jauu•net>,
"Eric Dumazet" <eric.dumazet@gmail•com>, <netdev@vger•kernel.org>
Subject: Re: [PATCH v3 net-next 2/2] netem: add cell concept to simulate special MAC behavior
Date: Thu, 1 Dec 2011 08:57:01 -0800 [thread overview]
Message-ID: <20111201085701.02f885c5@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <AE90C24D6B3A694183C094C60CF0A2F6D8AEFA@saturn3.aculab.com>
On Thu, 1 Dec 2011 16:38:51 -0000
"David Laight" <David.Laight@ACULAB•COM> wrote:
>
> > One idea to do small delays at higher speed is to insert
> > dummy pad frames into the device.
> > It would mean generating garbage, but would allow for
> > highly accurate fine grain delay.
>
> Not a good idea.
> They would have to be sent to a known MAC address
> otherwise all the ethernet switches would forward them
> on all output ports.
>
> David
>
>
Yes it would have to be a constant destination, not sure if there
is a discard value in Ethernet protocol spec.
next prev parent reply other threads:[~2011-12-01 16:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-30 22:20 [PATCH v3 net-next 1/2] netem: rate extension Hagen Paul Pfeifer
2011-11-30 22:20 ` [PATCH v3 net-next 2/2] netem: add cell concept to simulate special MAC behavior Hagen Paul Pfeifer
2011-12-01 3:30 ` Eric Dumazet
2011-12-01 8:25 ` Hagen Paul Pfeifer
2011-12-01 9:01 ` Eric Dumazet
2011-12-01 9:32 ` [PATCH net-next] netem: fix build error on 32bit arches Eric Dumazet
2011-12-01 9:46 ` Hagen Paul Pfeifer
2011-12-01 11:04 ` David Laight
2011-12-01 11:19 ` Eric Dumazet
2011-12-01 17:46 ` David Miller
2011-12-01 9:36 ` [PATCH v3 net-next 2/2] netem: add cell concept to simulate special MAC behavior Hagen Paul Pfeifer
2011-12-01 16:24 ` Stephen Hemminger
2011-12-01 16:38 ` David Laight
2011-12-01 16:57 ` Stephen Hemminger [this message]
2011-12-01 18:25 ` Rick Jones
2011-12-01 4:19 ` [PATCH v3 net-next 1/2] netem: rate extension David Miller
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