Re: [dpdk-stable] [dpdk-dev] [PATCH] doc: document libnuma requirement for NUMA systems

Re: [dpdk-stable] [dpdk-dev] [PATCH] doc: document libnuma requirement for NUMA systems

[Kevin Traynor]

On 01/31/2019 05:05 PM, Anatoly Burakov wrote:
> Since 18.05, libnuma is pretty much required on Linux when using
> non-legacy mode, because without it, we cannot know where our
> hugepages are located [1].
> 
> In legacy mode, libnuma is not required because we can still sort
> pages by sockets, as we use pagemap lookup method to figure out
> socket ID's for pages.
> 
> So, document libnuma as required for NUMA systems and non-legacy
> mode.
> 
> [1] https://mails.dpdk.org/archives/dev/2018-December/120490.html
> 

Might as well add to the stable docs also. Picking this commit as it's
where both mode are available

Fixes: 6b42f75632f0 ("eal: enable non-legacy memory mode")
Cc: stable@dpdk.org

> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> ---
>  doc/guides/linux_gsg/sys_reqs.rst | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst
> index 8ec3af491..23cfc27ab 100644
> --- a/doc/guides/linux_gsg/sys_reqs.rst
> +++ b/doc/guides/linux_gsg/sys_reqs.rst
> @@ -70,6 +70,14 @@ Compilation of the DPDK
>  
>      * libnuma-dev in Debian/Ubuntu;
>  
> +    .. note::
> +
> +        On systems with NUMA support, `libnuma-dev` (aka `numactl-devel`) is a
> +        recommended dependency when `--legacy-mem` switch is used, and a
> +        *required* dependency if default memory mode is used. While DPDK will
> +        compile and run without `libnuma` even on NUMA-enabled systems, both
> +        usability and performance will be degraded.
> +
>  *   Python, version 2.7+ or 3.2+, to use various helper scripts included in the DPDK package.
>  
>  
> 

Acked-by: Kevin Traynor <ktraynor@redhat.com>

Re: [dpdk-stable] [dpdk-dev] [PATCH] doc: document libnuma requirement for NUMA systems

[Burakov, Anatoly]

On 31-Jan-19 6:14 PM, Kevin Traynor wrote:
> On 01/31/2019 05:05 PM, Anatoly Burakov wrote:
>> Since 18.05, libnuma is pretty much required on Linux when using
>> non-legacy mode, because without it, we cannot know where our
>> hugepages are located [1].
>>
>> In legacy mode, libnuma is not required because we can still sort
>> pages by sockets, as we use pagemap lookup method to figure out
>> socket ID's for pages.
>>
>> So, document libnuma as required for NUMA systems and non-legacy
>> mode.
>>
>> [1] https://mails.dpdk.org/archives/dev/2018-December/120490.html
>>
> 
> Might as well add to the stable docs also. Picking this commit as it's
> where both mode are available
> 
> Fixes: 6b42f75632f0 ("eal: enable non-legacy memory mode")
> Cc: stable@dpdk.org

Yup, thought of that right after leaving office yesterday! :)

> 
>> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
>> ---
>>   doc/guides/linux_gsg/sys_reqs.rst | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst
>> index 8ec3af491..23cfc27ab 100644
>> --- a/doc/guides/linux_gsg/sys_reqs.rst
>> +++ b/doc/guides/linux_gsg/sys_reqs.rst
>> @@ -70,6 +70,14 @@ Compilation of the DPDK
>>   
>>       * libnuma-dev in Debian/Ubuntu;
>>   
>> +    .. note::
>> +
>> +        On systems with NUMA support, `libnuma-dev` (aka `numactl-devel`) is a
>> +        recommended dependency when `--legacy-mem` switch is used, and a
>> +        *required* dependency if default memory mode is used. While DPDK will
>> +        compile and run without `libnuma` even on NUMA-enabled systems, both
>> +        usability and performance will be degraded.
>> +
>>   *   Python, version 2.7+ or 3.2+, to use various helper scripts included in the DPDK package.
>>   
>>   
>>
> 
> Acked-by: Kevin Traynor <ktraynor@redhat.com>
> 


-- 
Thanks,
Anatoly

Re: [dpdk-stable] [dpdk-dev] [PATCH] doc: document libnuma requirement for NUMA systems

[Thomas Monjalon]

01/02/2019 11:28, Burakov, Anatoly:
> On 31-Jan-19 6:14 PM, Kevin Traynor wrote:
> > On 01/31/2019 05:05 PM, Anatoly Burakov wrote:
> >> Since 18.05, libnuma is pretty much required on Linux when using
> >> non-legacy mode, because without it, we cannot know where our
> >> hugepages are located [1].
> >>
> >> In legacy mode, libnuma is not required because we can still sort
> >> pages by sockets, as we use pagemap lookup method to figure out
> >> socket ID's for pages.
> >>
> >> So, document libnuma as required for NUMA systems and non-legacy
> >> mode.
> >>
> >> [1] https://mails.dpdk.org/archives/dev/2018-December/120490.html
> >>
> > 
> > Might as well add to the stable docs also. Picking this commit as it's
> > where both mode are available
> > 
> > Fixes: 6b42f75632f0 ("eal: enable non-legacy memory mode")
> > Cc: stable@dpdk.org
> 
> Yup, thought of that right after leaving office yesterday! :)

Applied, thanks