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Date:   Tue, 15 Sep 2020 10:47:36 +0200
From:   Toke Høiland-Jørgensen <>
To:     Maciej Żenczykowski <>,
        Jesper Dangaard Brouer <>
Cc:     Jakub Kicinski <>, bpf <>,
        Linux NetDev <>,
        Daniel Borkmann <>,
        Alexei Starovoitov <>,
        John Fastabend <>
Subject: Re: [PATCH bpf-next] bpf: don't check against device MTU in

[ just jumping in to answer this bit: ]

> Would you happen to know what ebpf startup overhead is?
> How big a problem is having two (or more) back to back tc programs
> instead of one?

With a jit'ed BPF program and the in-kernel dispatcher code (which
avoids indirect calls), it's quite close to a native function call.

> We're running into both verifier performance scaling problems and code
> ownership issues with large programs...
> [btw. I understand for XDP we could only use 1 program anyway...]

Working on that! See my talk at LPC:

Will post a follow-up to the list once the freplace multi-attach series


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