netdev - Re: loaded router, excessive getnstimeofday in oprofile

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Message-ID: <20080826201406.GA24827@2ka.mipt.ru>
Date:	Wed, 27 Aug 2008 00:14:07 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: loaded router, excessive getnstimeofday in oprofile

On Fri, Aug 22, 2008 at 04:57:40AM +0300, Denys Fedoryshchenko (denys@...p.net.lb) wrote:
> I have loaded router (~650 Mbps In+Out), based on 2xAMD Opteron 248, Sun Fire 
> X4100. HPET timer available (TSC seems not available on this platform).
> Network interfaces is onboard, connected over PCI-X.
> 
> Right now i am using only one processor, cause using only one interface and 
> interrupts stick to it. Other is almost not used.
> At peak time i notice in mpstat, that this processor is almost "dead", and if 
> i run minor application consuming resources - ping over this router will be 
> terrible. For me it is clear - system overloaded. I did oprofile, and here is 
> result (at low load time, but at peak time it is very similar).

Do you have any packet sockets in this system? Like running dhcp daemon?

-- 
	Evgeniy Polyakov
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