From: Kevin Traynor <ktraynor@redhat.com>
To: Anatoly Burakov <anatoly.burakov@intel.com>, dev@dpdk.org
Cc: John McNamara <john.mcnamara@intel.com>,
Marko Kovacevic <marko.kovacevic@intel.com>,
thomas@monjalon.net, "stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] doc: document libnuma requirement for NUMA systems
Date: Thu, 31 Jan 2019 18:14:51 +0000 [thread overview]
Message-ID: <f2c7592f-b1f9-36be-f913-fb55c7d01a3d@redhat.com> (raw)
In-Reply-To: <93e6481f516c2549308e0745388a0bd80b44e783.1548954304.git.anatoly.burakov@intel.com>
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>
next prev parent reply other threads:[~2019-01-31 18:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 17:05 Anatoly Burakov
2019-01-31 18:14 ` Kevin Traynor [this message]
2019-02-01 10:28 ` Burakov, Anatoly
2019-02-01 10:51 ` Thomas Monjalon
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