netdev - Re: [PATCH 1/3] bpf: allow zero-initializing hash map seed

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Date:   Mon, 8 Oct 2018 10:48:29 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jann Horn <jannh@...gle.com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 1/3] bpf: allow zero-initializing hash map seed

On Fri, 5 Oct 2018 at 22:07, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Fri, Oct 05, 2018 at 04:27:58PM +0200, Jann Horn wrote:
> >
> > Can you please describe exactly why something that is not a kernel
> > unit test needs deterministic BPF hash map behavior?
>
> my use case for deterministic hashing is performance analysis.
> Both while developing and tuning bpf program and while optimizing
> kernel side implementation.
> Local dos is a valid concern, so requiring root for this flag makes sense.
>

Ok, I'll respin and address the comments.

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Lorenz Bauer  |  Systems Engineer
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