netdev - Re: [PATCH] Stochastic Fair Blue queue discipline

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Message-ID: <20080408175353.GA17147@one.firstfloor.org>
Date:	Tue, 8 Apr 2008 19:53:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Juliusz Chroboczek <Juliusz.Chroboczek@....jussieu.fr>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org
Subject: Re: [PATCH] Stochastic Fair Blue queue discipline

On Tue, Apr 08, 2008 at 07:35:36PM +0200, Juliusz Chroboczek wrote:
> > no net_random/srandom32 is per CPU and likely does the wrong thing for you.
> 
> Why is that?  I'm only using this to initialise a global data
> structure, why should it matter that I use per-cpu state?

Because they're independent and there is no guarantee you always 
run on the same CPU and sampling them randomly will not necessarily
give you a good random number sequence.

-Andi
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