netdev - Re: [PATCH bpf-next] selftests/bpf: two scale tests

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Message-ID: <CAPhsuW5kh_rQxBncvtknRRDKZgUkayNCQDej+3EF_7WggC4UVw@mail.gmail.com>
Date:   Sun, 14 Apr 2019 22:59:08 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next] selftests/bpf: two scale tests

On Fri, Apr 12, 2019 at 4:32 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Fri, Apr 12, 2019 at 04:24:51PM -0700, Song Liu wrote:
> > On Fri, Apr 12, 2019 at 2:41 PM Alexei Starovoitov <ast@...nel.org> wrote:
> > >
> > > Add two tests to check that sequence of 1024 jumps is verifiable.
> > >
> > > Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> >
> > Acked-by: Song Liu <songliubraving@...com>
> >
> > Shall we add a test that go beyond the 1M limit?
>
> 1m is not uapi limit. I'm working on the doc patch to stress that point.
> Adding a test to check that it fails at 1m would kinda imply
> that it is uapi and I very much want to avoid that.
>
> The purpose of these tests is to stress the verifier to its
> internal limits, but not more.
> In particular in these two tests 1024, 8, 512, and another 1M
> are limits too.
>

Yeah, this makes sense. Thanks for the explanation.

Song