netdev - Re: [PATCH net-next v2 9/9] xen-netback: Aggregate TX unmap operations

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Message-ID: <20131213154435.GP21900@zion.uk.xensource.com>
Date:	Fri, 13 Dec 2013 15:44:35 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	<ian.campbell@...rix.com>, <wei.liu2@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <jonathan.davies@...rix.com>
Subject: Re: [PATCH net-next v2 9/9] xen-netback: Aggregate TX unmap
 operations

On Thu, Dec 12, 2013 at 11:48:17PM +0000, Zoltan Kiss wrote:
> Unmapping causes TLB flushing, therefore we should make it in the largest
> possible batches. However we shouldn't starve the guest for too long. So if
> the guest has space for at least two big packets and we don't have at least a
> quarter ring to unmap, delay it for at most 1 milisec.
> 

Is this solution temporary or permanent? If it is permanent would it
make sense to make these parameter tunable?

Wei.
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