linux-kernel - Re: [PATCH 3/3] Convert the UDP hash lock to RCU

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Message-ID: <20081007232056.036e26e6@speedy>
Date:	Tue, 7 Oct 2008 23:20:56 +0200
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	dada1@...mosbay.com, benny+usenet@...rsen.dk, minyard@....org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH 3/3] Convert the UDP hash lock to RCU

On Tue, 07 Oct 2008 13:55:48 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Tue, 7 Oct 2008 16:07:29 +0200
> 
> > The idea of keeping chains short is the problem. That code should
> > just be pulled because it doesn't help that much, and also creates
> > bias on the port randomization.
> 
> I have that patch from Vitaly Mayatskikh which does exactly this.
> 
> I keep looking at it, but I can't bring myself to apply it since
> I'm not completely convinced.

Some one on a busy server should run it and measure the delta in hash chains.
I would, but don't run anything that has more than a few UDP's open.
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