netdev - Re: [Xen-devel] [PATCH net-next 2/3] xen-netback: switch to per-cpu scratch space

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Message-ID: <519F5C09.3030502@citrix.com>
Date:	Fri, 24 May 2013 13:24:41 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
	<ian.campbell@...rix.com>, <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH net-next 2/3] xen-netback: switch to per-cpu
 scratch space

On 24/05/13 11:32, Wei Liu wrote:
> There are maximum nr_onlie_cpus netback threads running. We can make use of
> per-cpu scratch space to reduce the size of buffer space when we move to 1:1
> model.

How much memory does this actually save?  At first glance the savings
don't seem worth it for the extra complexity wrt hotplugged VCPUs etc.

David
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