[dpdk-dev] [PATCH 20.11 02/12] eal: add default SIMD bitwidth values

Power, Ciara ciara.power at intel.com
Wed Aug 12 13:28:03 CEST 2020


Hi David,


>-----Original Message-----
>From: David Christensen <drc at linux.vnet.ibm.com>
>Sent: Friday 7 August 2020 17:32
>To: Power, Ciara <ciara.power at intel.com>; dev at dpdk.org
>Cc: Richardson, Bruce <bruce.richardson at intel.com>; Ruifeng Wang
><ruifeng.wang at arm.com>; Jerin Jacob <jerinj at marvell.com>; Honnappa
>Nagarahalli <honnappa.nagarahalli at arm.com>
>Subject: Re: [PATCH 20.11 02/12] eal: add default SIMD bitwidth values
>
>On 8/7/20 8:58 AM, Ciara Power wrote:
>> Each arch has a define for the default SIMD bitwidth value, this is
>> used on EAL init to set the config max SIMD bitwidth.
>
>What's the intended use case?


- For x86, it allows other apps such as OVS and VPP which already make use of
  AVX-512 to indicate that they are happy for DPDK to use AVX-512 too.
- It allows the end-user to override those settings if so desired.
- For all architectures, it allows an easy way to disable vector code or limit vector
  length if so desired, which can be useful for testing.


<snip>


Thanks,
Ciara


More information about the dev mailing list