netdev - Re: tun: performance regression in 2.6.30-rc1

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Date:	Fri, 17 Apr 2009 07:57:53 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Michael S. Tsirkin" <m.s.tsirkin@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: tun: performance regression in 2.6.30-rc1

On Fri, Apr 17, 2009 at 01:15:05AM +0300, Michael S. Tsirkin wrote:
>
> Continuing with the investigation, commenting out
> atomic_inc_not_zero and atomic_dec_and_test in tun_get/tun_put
> gets us back most of the rest of the performance:

I'll try to think of a way to kill these ref counts, once I get
my other patch fixed :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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