linux-kernel - Re: [PATCH V6 0/4 net-next] macvtap/vhost TX zero-copy support

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Message-ID: <1306441885.5180.52.camel@localhost.localdomain>
Date:	Thu, 26 May 2011 13:31:25 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 0/4 net-next] macvtap/vhost TX zero-copy support

On Thu, 2011-05-26 at 23:28 +0300, Michael S. Tsirkin wrote:
> On Thu, May 26, 2011 at 01:00:20PM -0700, Shirley Ma wrote:
> > 3. Add sleep in vhost shutting down instead of busy-wait for
> outstanding
> >    DMAs.
> 
> I still think this is not much better. We need to use a
> completion structure and wait on it instead.
> If this gets blocked thinkably a tx watchdog can fire and save us
> from blocking forver :) 

Ok, I can add a completion structure here.

Thanks
Shirley

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