netdev - Re: [RFC PATCH v2 bpf-next 00/15] xdp

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Date:   Mon, 28 Oct 2019 13:07:54 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jesper Dangaard Brouer <jbrouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Toshiaki Makita <toshiaki.makita1@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Pravin B Shelar <pshelar@....org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, William Tu <u9012063@...il.com>,
        Stanislav Fomichev <sdf@...ichev.me>
Subject: Re: [RFC PATCH v2 bpf-next 00/15] xdp_flow: Flow offload to XDP

On 10/28/19 4:08 AM, Jesper Dangaard Brouer wrote:
>>> Either way, bypassing the bridge has mixed results: latency improves
>>> but throughput takes a hit (no GRO).  
>>
>> Well, for some traffic mixes XDP should be able to keep up without GRO.
>> And longer term, we probably want to support GRO with XDP anyway
> 
> Do you have any numbers to back up your expected throughput decrease,
> due to lack of GRO?  Or is it a theory?
> 

of course. I'll start a new thread about this rather than go too far
down this tangent relative to the current patches.