linux-kernel - Re: [PATCH net-next] Revert "xen-netback: Aggregate TX unmap operations"

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Message-Id: <20140325.185824.890778229733178891.davem@davemloft.net>
Date:	Tue, 25 Mar 2014 18:58:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	Ian.Campbell@...rix.com
Cc:	zoltan.kiss@...rix.com, wei.liu2@...rix.com,
	xen-devel@...ts.xenproject.org, paul.durrant@...rix.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jonathan.davies@...rix.com
Subject: Re: [PATCH net-next] Revert "xen-netback: Aggregate TX unmap
 operations"

From: Ian Campbell <Ian.Campbell@...rix.com>
Date: Mon, 24 Mar 2014 09:26:47 +0000

> On Fri, 2014-03-21 at 17:23 +0000, Zoltan Kiss wrote:
>> This reverts commit e9275f5e2df1b2098a8cc405d87b88b9affd73e6. This commit is the
>> last in the netback grant mapping series, and it tries to do more aggressive
>> aggreagtion of unmap operations. However practical use showed almost no
>> positive effect, whilst with certain frontends it causes significant performance
>> regression.
> 
> That's a shame -- do you have any insight into why?
> 
>> Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
> 
> Acked-by: Ian Campbell <ian.campbell@...rix.com>

Applied, thanks.
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