netdev - Re: [PATCH net-next] pkt_sched: fq: better control of DDOS traffic

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Message-ID: <1422934443.21689.140.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 02 Feb 2015 19:34:03 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] pkt_sched: fq: better control of DDOS traffic

On Mon, 2015-02-02 at 18:18 -0800, David Miller wrote:

> Can you document the mask value a little bit more?
> 
> For example, I don't understand why "(1024 - 1) << 1" means 1024
> slots just from looking at this change.
> 

Sure , will do.

Thats because we reserve low order bit of the sk/hash value,
to make sure the stochastic hash is only applied on non locally
generated traffic.

Thanks



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