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

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Message-ID: <20110526202836.GA1951@redhat.com>
Date:	Thu, 26 May 2011 23:28:36 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.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, 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 :)
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