netdev - Re: [PATCH v2] PPC: bpf_jit_comp: add SKF_AD

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Date:	Sat, 01 Nov 2014 19:40:38 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Denis Kirjanov <kirjanov@...il.com>
CC:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Denis Kirjanov <kda@...ux-powerpc.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linuxppc-dev@...abs.org, Michael Ellerman <mpe@...erman.id.au>,
	Matt Evans <matt@...abs.org>
Subject: Re: [PATCH v2] PPC: bpf_jit_comp: add SKF_AD_PKTTYPE instruction

On 10/31/2014 07:09 AM, Denis Kirjanov wrote:
> On 10/30/14, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
>> On Wed, Oct 29, 2014 at 11:12 PM, Denis Kirjanov <kda@...ux-powerpc.org>
>> wrote:
>>> Add BPF extension SKF_AD_PKTTYPE to ppc JIT to load
>>> skb->pkt_type field.
>>>
>>> Before:
>>> [   88.262622] test_bpf: #11 LD_IND_NET 86 97 99 PASS
>>> [   88.265740] test_bpf: #12 LD_PKTTYPE 109 107 PASS
>>>
>>> After:
>>> [   80.605964] test_bpf: #11 LD_IND_NET 44 40 39 PASS
>>> [   80.607370] test_bpf: #12 LD_PKTTYPE 9 9 PASS
>>
>> if you'd only quoted #12, it would all make sense ;)
>> but #11 test is not using PKTTYPE. So your patch shouldn't
>> make a difference. Are these numbers with JIT on and off?
>
> Right.

Ok.

Please mention this in future log messages, as it was not quite
clear that "before" was actually with JIT off, and "after" was
with JIT on.

One could have read it that actually both cases were with JIT on,
and thus the inconsistent result for LD_IND_NET is a bit confusing
since you've quoted it here as well.
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