netdev - Re: [PATCH v2] net-tun: restructure tun_do_read for better sleep/wakeup efficiency

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Date:	Tue, 20 May 2014 09:35:51 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jason Wang <jasowang@...hat.com>, Xi Wang <xii@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Maxim Krasnyansky <maxk@....qualcomm.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2] net-tun: restructure tun_do_read for better
 sleep/wakeup efficiency

On Mon, May 19, 2014 at 09:52:39PM -0700, Eric Dumazet wrote:
> On Tue, 2014-05-20 at 12:44 +0800, Jason Wang wrote:
> 
> > But this changes (sk_data_ready()) has nothing related to switching to
> > use __skb_recv_datagram()
> 
> I think I will give up at this point, this is becoming too much time to
> gain only 15% of cpu.
> 

Ouch I did like the patch, less code and more performance.
I hope we'll be able to save it still, please be patient
Jason's just being cautious trying to make sure we don't
break existing userspace.


-- 
MST
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