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

To: Wei Liu <wei.liu2@xxxxxxxxxx>
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Fri, 24 May 2013 13:24:41 +0100
Cc: netdev@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, ian.campbell@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxx
Delivery-date: Fri, 24 May 2013 12:24:59 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

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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Follow-Ups:
- Re: [Xen-devel] [PATCH net-next 2/3] xen-netback: switch to per-cpu scratch space
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References:
- [Xen-devel] [PATCH net-next 0/3] xen-netback: switch to NAPI + kthread 1:1 model
  - From: Wei Liu
- [Xen-devel] [PATCH net-next 2/3] xen-netback: switch to per-cpu scratch space
  - From: Wei Liu

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