netdev - Re: [PATCHv1 net] xen-netback: notify immediately after pushing Tx response.

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Message-ID: <20150311174419.GB15153@zion.uk.xensource.com>
Date:	Wed, 11 Mar 2015 17:44:19 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	<netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>
Subject: Re: [PATCHv1 net] xen-netback: notify immediately after pushing Tx
 response.

On Wed, Mar 11, 2015 at 03:27:59PM +0000, David Vrabel wrote:
> This fixes a performance regression introduced by
> 7fbb9d8415d4a51cf542e87cf3a717a9f7e6aedc (xen-netback: release pending
> index before pushing Tx responses)
> 
> Moving the notify outside of the spin locks means it can be delayed a
> long time (if the dealloc thread is descheduled or there is an
> interrupt or softirq).
> 
> Signed-off-by: David Vrabel <david.vrabel@...rix.com>

Acked-by: Wei Liu <wei.liu2@...rix.com>
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