netdev - Re: selftests/bpf/test_tag takes ~30 minutes?

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Date:   Mon, 6 May 2019 11:33:19 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: selftests/bpf/test_tag takes ~30 minutes?

On 04/30/2019 03:21 PM, Michael Ellerman wrote:
> Hi Daniel,
> 
> I'm running selftests/bpf/test_tag and it's taking roughly half an hour
> to complete, is that expected?
> 
> I don't really grok what the test is doing TBH, but it does appear to be
> doing it 5 times :)
> 
> 	for (i = 0; i < 5; i++) {
> 		do_test(&tests, 2, -1,     bpf_gen_imm_prog);
> 		do_test(&tests, 3, fd_map, bpf_gen_map_prog);
> 	}
> 
> Could we make it just do one iteration by default? That would hopefully
> reduce the runtime by quite a bit. It could take a parameter to run the
> longer version perhaps?

On my 2.5 years old laptop it's taking 16 seconds. ;) I'm okay if we
reduce the runs and add a long version via cmdline param. It's basically
comparing the sha based tag generation from the BPF core with plain AF_ALG
from crypto subsys over the same insn sequence to make sure both match fine.

Thanks,
Daniel