netdev - Re: cpu utilisation improvement when not doing netif_tx_{stop,wake}

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Message-Id: <E1KYyCW-00025D-00@gondolin.me.apana.org.au>
Date:	Fri, 29 Aug 2008 17:15:20 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	buytenh@...tstofly.org (Lennert Buytenhek)
Cc:	davem@...emloft.net, netdev@...r.kernel.org, dale@...nsworth.org,
	nico@....org
Subject: Re: cpu utilisation improvement when not doing netif_tx_{stop,wake}_queue()

Lennert Buytenhek <buytenh@...tstofly.org> wrote:
> 
> I.e. transmitting wire speed gigabit over a single TCP session takes
> around 90% CPU time (measured with cyclesoak) if I have the TX queue
> flow control enabled, but only 70% if I rip the TX queue flow control
> out.  (This is on a relatively underpowered ARM box.)

How many cores and how many queues?

Cheers,
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