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From: Andi Kleen <andi@firstfloor.org>
To: Juliusz Chroboczek <Juliusz.Chroboczek@pps.jussieu.fr>
Cc: Andi Kleen <andi@firstfloor.org>, netdev@vger.kernel.org
Subject: Re: [PATCH] Stochastic Fair Blue queue discipline
Date: Tue, 8 Apr 2008 19:53:53 +0200	[thread overview]
Message-ID: <20080408175353.GA17147@one.firstfloor.org> (raw)
In-Reply-To: <7iwsn8s107.fsf@lanthane.pps.jussieu.fr>

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

  reply	other threads:[~2008-04-08 17:49 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-07 22:37 [PATCH] Stochastic Fair Blue queue discipline Juliusz Chroboczek
2008-04-08  0:04 ` Patrick McHardy
2008-04-08  0:56   ` Patrick McHardy
2008-04-08 15:28   ` Juliusz Chroboczek
2008-04-08  8:20 ` Andi Kleen
2008-04-08 12:11   ` Patrick McHardy
2008-04-08 15:39     ` Juliusz Chroboczek
2008-04-08 15:45       ` Patrick McHardy
2008-04-09 15:48         ` Juliusz Chroboczek
2008-04-09 16:00           ` Patrick McHardy
2008-04-08 15:38   ` Juliusz Chroboczek
2008-04-08 16:32     ` Andi Kleen
2008-04-08 17:35       ` Juliusz Chroboczek
2008-04-08 17:53         ` Andi Kleen [this message]
2008-04-09 15:45           ` Juliusz Chroboczek
2008-04-09 17:49             ` Andi Kleen
2008-04-10  1:23               ` Patrick McHardy
2008-04-10  1:38                 ` Patrick McHardy
2008-04-10 11:17                   ` Juliusz Chroboczek
2008-04-11 13:07                     ` Patrick McHardy
2008-04-10 14:04                   ` Stephen Hemminger
2008-04-10  7:36                 ` Andi Kleen
2008-04-08 16:44 ` Patrick McHardy

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