netdev - Re: [net-next-2.6 PATCH] net: fast consecutive name allocation

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Message-ID: <20091115165015.GU19478@kvack.org>
Date:	Sun, 15 Nov 2009 11:50:15 -0500
From:	Benjamin LaHaise <bcrl@...et.ca>
To:	Denys Fedoryschenko <denys@...p.net.lb>
Cc:	Mark Smith <lk-netdev@...netdev.nosense.org>,
	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	opurdila@...acom.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH] net: fast consecutive name allocation

Hi Denys,

On Sun, Nov 15, 2009 at 03:55:14AM +0200, Denys Fedoryschenko wrote:
> And interface creation speed is important for me, when electricity goes down 
> here, many customers disconnects (up to 500 on single NAS), and then join 
> again to NAS. Load average was jumping to sky on such situations, just option 
> to not create sysfs entries helped me a lot (was posted recently).
> Electricity outage is usual here, happens 2-3 times daily.

This is exactly the type of scenario I'm looking at.  The design of the 
Babylon PPP stack is meant to scale somewhat better that pppd.  It uses a 
single process (although I'm starting to add threads to improve scaling on 
SMP systems) for all PPP/L2TP sessions, and has rather lower connection 
setup overhead (no fork()/exec() being the biggest one).  With udev tuned, 
irqbalance disabled and a few other tweaks, it gets >500 connections per 
second in startup on a modern 2.6GHz processor for L2TP traffic.  There 
is PPPoE support, but it needs a bit more work done to scale automatically 
(there are a few hardcoded limits in the PPPoE implementation).

		-ben
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