[Click] insmod: error inserting '/usr/local/lib/click.ko': -1 Cannot allocate memory

[Daniel Borkmann]

On Wed, Oct 5, 2011 at 4:06 PM, Eddie Kohler <kohler at cs.ucla.edu> wrote:
> I'm thinking probably we should do that automatically.

Hmm, if someone wants to do debugging, then it might not work (since
the syms are stripped), except you have a special target for debug,
for instance.

What I recently noticed running Click in kernelspace: the number of
context switches per second is very high (... too high) on a high
packet rate. More details:

I have two machines Intel Core 2 Quad Q6600 CPU, 4 GB RAM, Intel
82566DC Ethernet Controller (e1000e driver). Both have Debian 6.0. One
machine has a vanilla Linux 3.0 running pktgen with 64 Byte packets
(max. load), the other one is running Linux 2.6.38 with click in
kernelspace. Both are directly connected. The config is:
source::FromDevice(eth0); drop::SimpleIdle; source->drop. I was
measuring packets per second and the system's context switches per
second, both gathered from procfs. The result was that I reached about
460k pps while having a context switch rate of about 200k cs/sec (!).
(The high rate explains the rather low pps rate.) Running
(multithreaded) click in userspace on top of Linux 3.0, I got about
545k pps and less than 1000 cs/sec.

Has anyone measured similar values? Could it be, that the click kernel
thread is pushing away CPU time for the ksoftirqd doing NAPI (sofirqs
for RX) on the e1000e?

Thanks,
Daniel

>
> Eddie
>
> On 10/5/11 9:32 AM, Daniel Borkmann wrote:
>>
>> Hi Sandeep,
>>
>> thanks for your reply! :-)
>>
>> Stripping the debug symbols out of the module like ...
>>
>> root at xyz:~# strip -g /usr/local/lib/click.ko
>>
>> ... worked for me; I already was on the latest Git repository.
>>
>> Thanks,
>> Daniel
>>
>> On Wed, Oct 5, 2011 at 3:14 PM, sandeep<sandeep048 at gmail.com>  wrote:
>>>
>>> I also had the same problem but it disappeared after I updated to the
>>> latest
>>> git repository. https://github.com/kohler/click/tarball/master
>>>
>>> Kind Regards,
>>> Sandeep,
>>> PhD Student,
>>> CTVR - Trinity College Dublin
>>> On Wed, Oct 5, 2011 at 1:36 PM, Daniel Borkmann<borkmann at iogearbox.net>
>>> wrote:
>>>>
>>>> Hi list,
>>>> I managed to build the patchless Click kernel version under 2.6.38,
>>>> but insmod fails with the following:
>>>>
>>>> root at pc-10089:~# click-install forw.click
>>>> insmod: error inserting '/usr/local/lib/click.ko': -1 Cannot allocate
>>>> memory
>>>> click-install: '/sbin/insmod /usr/local/lib/click.ko' failed
>>>>
>>>> Any ideas? Did anyone have same issues?
>>>>
>>>> Thanks,
>>>> Daniel
>>>> _______________________________________________
>>>> click mailing list
>>>> click at amsterdam.lcs.mit.edu
>>>> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>>>
>>>
>>
>>
>>
>



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