Re: [Xen-devel] [PATCH V4 1/3] xen-netback: remove page tracking facility

[Matt Wilson <msw@xxxxxxxxxx>]

On Tue, Aug 06, 2013 at 10:06:01AM +0100, Wei Liu wrote:
> The data flow from DomU to DomU on the same host in current copying
> scheme with tracking facility:
> 
>        copy
> DomU --------> Dom0          DomU
>  |                            ^
>  |____________________________|
>              copy
> 
> The page in Dom0 is a page with valid MFN. So we can always copy from
> page Dom0, thus removing the need for a tracking facility.
> 
>        copy           copy
> DomU --------> Dom0 -------> DomU
> 
> Simple iperf test shows no performance regression (obviously we copy
> twice either way):
> 
>   W/  tracking: ~5.3Gb/s
>   W/o tracking: ~5.4Gb/s
> 
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Acked-by: Matt Wilson <msw@xxxxxxxxxx>

> ---
>  drivers/net/xen-netback/netback.c |   77 
> +------------------------------------
>  1 file changed, 2 insertions(+), 75 deletions(-)

[...]

--msw

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