linux-kernel - Re: UDP packets scheduling

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Date:	Tue, 20 Mar 2007 17:55:31 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Lukas Hejtmanek <xhejtman@...l.muni.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Andi Kleen <andi@...stfloor.org>
Subject: Re: UDP packets scheduling

Lukas Hejtmanek wrote:
> On Tue, Mar 20, 2007 at 06:52:51PM +0100, Andi Kleen wrote:
>>> Flow control must be turned off for some other reason.
>> That's your fundamental problem. Fix that. 
>>
>> Even if you get the rate right there can be many reasons why timing 
>> gets disrupted temporarily and to recover from any of this you need
>> working flow control.
> 
> How do you want to enable wire/fibre flow control, e.g., from Europe to USA?
> You are not guaranteed any hardware based flow control.
> 
> And as of software flow control, you need precise timing of UDP packets to
> keep desired packet rate. How to do it at speeds about 5.5Gbps, that is my
> question.

Why is it necessary to avoid bursting? There should be enough buffering 
along the chain to avoid packet loss with reasonable burst sizes.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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