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

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Message-ID: <1395653207.19365.1.camel@kazak.uk.xensource.com>
Date:	Mon, 24 Mar 2014 09:26:47 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	<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"

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>


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