linux-kernel - Re: [PATCH 2/6] test_bpf: allow tests to specify an skb fragment.

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Message-ID: <55BFA6DE.7040108@iogearbox.net>
Date:	Mon, 03 Aug 2015 19:37:34 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Nicolas Schichan <nschichan@...ebox.fr>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] test_bpf: allow tests to specify an skb fragment.

On 08/03/2015 06:38 PM, Nicolas Schichan wrote:
> On 08/03/2015 05:29 PM, Daniel Borkmann wrote:
>> On 08/03/2015 04:02 PM, Nicolas Schichan wrote:
>> We now have 286 tests, which is awesome!
>>
>> Perhaps, we need to start thinking of a better test description method
>> soonish as the test_bpf.ko module grew to ~1.6M, i.e. whenever we add
>> to struct bpf_test, it adds memory overhead upon all test cases.
>
> Indeed, test_bpf.ko is turning quite large (1.4M when compiled for ARM).
>
> It looks like gzip is able to do wonders on the module though as I end up with
> a 94.7K test_bpf.ko.gz file and if the modutils are compiled with
> --enable-zlib, it will be gunziped automatically before being loaded to the
> kernel.

I think it just contains a lot of zero blocks, which then compress nicely.

> I think that marking tests[] array as __initdata will help with the runtime
> memory use if someone forgets to rmmod the test_bpf module after a completely
> successful run.

Can be done, too, yep. Do you want to send a patch? ;)
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