netdev - Re: [patch net-next v3 2/2] net: core: introduce mini_Qdisc and eliminate usage of tp->q for clsact fastpath

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Message-ID: <59F9A0FE.2040608@iogearbox.net>
Date:   Wed, 01 Nov 2017 11:25:02 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
CC:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, mlxsw@...lanox.com, edumazet@...gle.com,
        alexander.h.duyck@...el.com, willemb@...gle.com,
        john.fastabend@...il.com
Subject: Re: [patch net-next v3 2/2] net: core: introduce mini_Qdisc and eliminate
 usage of tp->q for clsact fastpath

On 11/01/2017 03:12 AM, Alexei Starovoitov wrote:
> On Tue, Oct 31, 2017 at 04:12:22PM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
[...]
> I don't think it's great, but I don't have any suggestions on
> how to avoid it, so I'm not objecting. Just disappointed that
> you keep adding stuff to tc and messing with sw fast path only to
> make parity with some obscure hw feature.

tc became a sink for that over time.

> If it keeps going like this we'd need to come up with some new fast
> hook for clsbpf in ingress/egress paths. We use it for
> every packet, so extra loads are not great.
> I guess they should be cache hits, but will take extra cache line.
> All of the bugs in tc logic recently are not comforting either.

+1