netdev - Re: [bpf-next,v2 0/6] Introduce a BPF helper to generate SYN cookies

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Date:   Tue, 30 Jul 2019 21:12:19 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Petar Penkov <ppenkov@...gle.com>
Cc:     Petar Penkov <ppenkov.kernel@...il.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [bpf-next,v2 0/6] Introduce a BPF helper to generate SYN cookies

On Mon, Jul 29, 2019 at 4:46 PM Petar Penkov <ppenkov@...gle.com> wrote:
>>
> > What is cpu utilization at this rate?
> > Is it cpu or nic limited if you crank up the syn flood?
> > Original 7M with all cores or single core?
> My receiver was configured with 16rx queues and 16 cores. 7M all cores
> are at 100% so I believe this case is CPU limited. At XDP, all cores
> are at roughly 40%. I couldn't reliably generate higher SYN flood rate
> than that, and the highest numbers I could see for XDP did not go past
> 10.65Mpps with ~42% utilization on each core. I think I am hitting a
> NIC limit here since the CPUs are free.

Applied. Thanks!