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To: Kevin Traynor <ktraynor@redhat.com>, dev@dpdk.org
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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
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Date: Fri, 1 Feb 2019 10:28:44 +0000
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Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] doc: document libnuma
requirement for NUMA systems
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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