Re: [PATCH v2] xen-netback: add a pseudo pps rate limit

[William Dauchy <william@gandi.net>]

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On Jun24 17:22, William Dauchy wrote:
> VM traffic is already limited by a throughput limit, but there is no
> control over the maximum packet per second (PPS).
> In DDOS attack the major issue is rather PPS than throughput.
> With provider offering more bandwidth to VMs, it becames easy to
> coordinate a massive attack using VMs. Example: 100Mbits ~ 200kpps using
> 64B packets.
> This patch provides a new option to limit VMs maximum packets per second
> emission rate.
> It follows the same credits logic used for throughput shaping. For the
> moment we have considered each "txreq" as a packet.
> PPS limits is passed to VIF at connection time via xenstore.
> PPS credit uses the same usecond period used by rate shaping check.
> 
> known limitations:
> - by using the same usecond period, PPS shaping depends on throughput
>   shaping.
> - it is not always true that a "txreq" correspond to a paquet
>   (fragmentation cases) but as this shaping is meant to avoid DDOS
>   (small paquets) such an pproximation should not impact the results.
> - Some help on burst handling will be appreciated.
> 
> v2:
> - fixing some typo

any chance to get it accepted? some other comments?

Regards,
-- 
William

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