Re: [PATCH v3 net-next 0/4] net: batched receive in GRO path

[Eric Dumazet]

On 11/14/2018 10:07 AM, Edward Cree wrote:
>
> Conclusion:
> * TCP b/w is 16.5% faster for traffic which cannot be coalesced by GRO.
>

But only for traffic that actually was perfect GRO candidate, right ?

Now what happens if all the packets you are batching are hitting different TCP 
sockets ?

(DDOS attack patterns)

By the time we build a list of 64 packets, the first packets in the list wont 
be anymore
in L1 cache (32 KB 8-way associative typically), and we will probably have 
cache trashing.