netdev - Re: [RFC] netem: correlated loss generation (v3)

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Message-ID: <20100520004330.GF5146@nuttenaction>
Date:	Thu, 20 May 2010 02:43:30 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Stefano Salsano <stefano.salsano@...roma2.it>,
	David Miller <davem@...emloft.net>,
	Fabio Ludovici <fabio.ludovici@...oo.it>,
	netdev@...r.kernel.org, netem@...ts.linuxfoundation.org
Subject: Re: [RFC] netem: correlated loss generation (v3)

* Stephen Hemminger | 2010-05-19 17:17:33 [-0700]:

>The old model was useful, but it really didn't do correlated loss.
>For legacy, the old syntax will go through the same code and generate
>the same result.

Is this really necessary? The right thing is to fix the broken behavior! If
the new patch provides this, great.  Imaging a network analysis for a PhD
dissertation based on a broken correlation algorithm - the whole results are
misleading and wrong. No one deserves this ... ;-)

If the current algorithm is broken then the mechanism must be fixed. Preserve
compatibility is counterproductive in this case.

>tc qdisc change dev eth0 root netem 
>      loss 2 10                              # compat syntax
>      loss random 2 10                       # same as above
>      loss deterministic file                # loss model based on bitmap
>      loss state p13 [p31 [p32 [p23 [p14]]]] # 4 state 
>      loss model  p [r [1-h [1-k]]]          # gilbert elliot model
>
>Any suggestions for better syntax are appreciated.

Not at the moment, looks clear and understandable.


Cheers, Hagen

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