Re: [dpdk-dev] disable hugepages

["Wiles, Keith" <keith.wiles@intel.com>]

> On Nov 10, 2016, at 6:32 AM, Keren Hochman <keren.hochman@lightcyber.com> wrote:
> 
> I tried using the following dpdk options:
> --no-huge --vdev eth_pcap0 ,rx_pcap=/t1,tx_pcap=/t2
> *It's worked but the number of elements is limited, although the machine
> has enough free memory. *rte_mempool_create is failed when I'm trying to
> allocate more memory. Is there any limitation on the memory beside the
> machine?

DPDK will just use the standard linux memory allocator, so no limitation in DPDK. Now you could be hitting the limit as a user, need to check your system to make sure you can allocate that much memory to a user. Try using the command ulimit and see what it reports.

I do not remember exactly how to change limits except with ulimit command. I may have modified /etc/security/limits.conf file.

HTH

> 
> *Thanks, Keren *
> 
> On Wed, Nov 9, 2016 at 4:50 PM, Olivier Matz <olivier.matz@6wind.com> wrote:
> 
>> Hi Keren,
>> 
>> On 11/09/2016 03:40 PM, Keren Hochman wrote:
>>> On Wed, Nov 9, 2016 at 3:40 PM, Christian Ehrhardt <
>>> christian.ehrhardt@canonical.com> wrote:
>>> 
>>>> 
>>>> On Wed, Nov 9, 2016 at 1:55 PM, Keren Hochman <
>>>> keren.hochman@lightcyber.com> wrote:
>>>> 
>>>>> how can I create mempool without hugepages?My application is running
>> on a
>>>>> pcap file so no huge pages is needed ?
>>>>> 
>>>> 
>>>> Not sure if that is what you really want (Debug use only), but in
>> general
>>>> no-huge is available as EAL arg
>>>> 
>>>> From http://pktgen.readthedocs.io/en/latest/usage_eal.html :
>>>> 
>>>> EAL options for DEBUG use only:
>>>>  --no-huge           : Use malloc instead of hugetlbfs
>>>> 
>>> I need this option only for testing. How can I use rte_mempool_create if
>> I
>>> use --no-huge?
>> 
>> When using --no-huge, the dpdk libraries (including mempool) allocate
>> its memory in standard memory. Just keep in mind the physical addresses
>> will be wrong, so this memory cannot be given to hw devices.
>> 
>> Regards,
>> Olivier
>> 

Regards,
Keith