[dpdk-dev] [PATCH v8 2/2] config: enable vhost numa awareness by default
jerin.jacob at caviumnetworks.com
Tue Jun 27 11:59:46 CEST 2017
> Date: Tue, 27 Jun 2017 15:11:07 +0530
> From: Hemant Agrawal <hemant.agrawal at nxp.com>
> To: Thomas Monjalon <thomas at monjalon.net>
> CC: Ilya Maximets <i.maximets at samsung.com>, dev at dpdk.org, David Marchand
> <david.marchand at 6wind.com>, Sergio Gonzalez Monroy
> <sergio.gonzalez.monroy at intel.com>, Heetae Ahn <heetae82.ahn at samsung.com>,
> Yuanhan Liu <yliu at fridaylinux.org>, Jianfeng Tan <jianfeng.tan at intel.com>,
> Neil Horman <nhorman at tuxdriver.com>, Yulong Pei <yulong.pei at intel.com>,
> Bruce Richardson <bruce.richardson at intel.com>, Jerin Jacob
> <jerin.jacob at caviumnetworks.com>
> Subject: Re: [PATCH v8 2/2] config: enable vhost numa awareness by default
> User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101
> On 6/27/2017 2:51 PM, Thomas Monjalon wrote:
> > 27/06/2017 11:18, Hemant Agrawal:
> > > On 6/27/2017 2:16 PM, Ilya Maximets wrote:
> > > > It is safe to enable LIBRTE_VHOST_NUMA by default for all
> > > > configurations where libnuma is already a default dependency.
> > > >
> > > > Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
> > > > ---
> > > > config/common_linuxapp | 1 +
> > > > config/defconfig_arm-armv7a-linuxapp-gcc | 1 +
> > > > config/defconfig_arm64-dpaa2-linuxapp-gcc | 1 +
> > > > 3 files changed, 3 insertions(+)
> > [...]
> > > > --- a/config/defconfig_arm64-dpaa2-linuxapp-gcc
> > > > +++ b/config/defconfig_arm64-dpaa2-linuxapp-gcc
> > > > @@ -47,6 +47,7 @@ CONFIG_RTE_PKTMBUF_HEADROOM=256
> > > >
> > > > # Doesn't support NUMA
> > > > CONFIG_RTE_EAL_NUMA_AWARE_HUGEPAGES=y
> > > > +CONFIG_RTE_LIBRTE_VHOST_NUMA=n
> > > >
> > > > #
> > > > # Compile Support Libraries for DPAA2
> > > >
> > >
> > > -1
> > > It should also be disabled for generic ARM64. This patch is breaking
> > > generic arm64 config tests on our platforms and creating a unnecessary
> > > dependency.
> > What do you mean? Which ARM64 platform is it breaking?
> > We can specifically disable it on more platforms.
> Unlike x86, ARM only represent a core architecture.
> Different platforms can integrate these cores differently in their SoCs.
> The stock ARM v8 cores do not provide support for NUMA in my knowledge.
A72 is just _an_ implementation of armv8. Not ARMv8 specification
itself. By specification it is NUMA capable and there are NUMA
> Some vendors have modified ARM cores (e.g. Cavium) to support NUMA
> architecture. However that is not a common phenomena.
> NUMA config should not be default for generic ARM config. It should be
> enabled only for architecture supporting it.
It just an build time dependency. Right? If you feed the libnuma package,
it will NON NUMA as well. Right? ARM64 libnuma package is already
available for major distributions.
My point is, I don't want to make arm64 generic config an exceptional case,
If DPDK common config creates libnuma dependency then there is no reason
for arm64 not have it. It is same for x86 and powerpc, non numa systems
> So, *arm64-armv8a-linuxapp-gcc* config is being used by several vendors
> include NXP. e.g. We use this config on several of our low end systems
> (non-dpaa). Also, we use it when running in VM with virtio interfaces on all
> of our different platforms (non-dpaa, dpaa1, dpaa2 etc).
On the same note, arm64-armv8a-linuxapp-gcc used by other vendors for Server machines
with NUMA and if want to keep creating new targets there is no end to it.
How hard is to install libnuma on VM? There is already package for it.
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