On Fri, 2019-01-18 at 05:50 +0000, Honnappa Nagarahalli wrote: > > > > > > > > Hi, > > > > > > > > > > > > > > > > The cacheline size (RTE_CACHE_LINE_SIZE) for ARM CPUs > > > > > > > > is set > > > > > > > > to be 128B by default. Mellanox's BlueField is an ARM > > > > > > > > CPU > > > > > > > > having > > > > > > > > Cortex-A72 > > > > > > > > and its CL size is 64B. > > > > > > Just wondering how many devices are out there with 128B > > > > > > cache > > > > > > line? I also have not heard about any future devices with > > > > > > 128B > > > > > > cache line. If the majority is 64B, why not keep 64B as the > > > > > > default? > > > > > > > > > > The problem is, In the armv8 spec the cache line size is > > > > > IMPLEMENTATION DEFINED. Marvell's embedded processors has > > > > > 128B > > CL > > > > > and Server processors has 64B CL. > > > > > > > > > > Assuming the defconfig_arm64-armv8a-linuxapp-gcc will be used > > > > > by > > > > > distro folks then that configuration should support all the > > > > > devices with > > > > > armv8.1 spec. For instance, marvells new chips are armv8.2 > > > > > but we > > > > > can not make that as default. > > > > What will happen in the future when we will have v9, v10 etc? I > > > > think the distro(generic/binary portable) config should get rid > > > > of v8. > > > > > > Will it be too much overhead if the image is same for v8, v9 and > > > v10. > > > I think, we can inline with what distro folks are doing for other > > > packages, I think, DPDK package does not need any exception. > > Yes, we need to be inline with any other package. My understanding > > is that > > the image will be same for v8,v9,v10 (any input from distro > > engineers will > > help here). So, my question is, should the config file/name used by > > distros > > contain anything specific to armv8? > Jerin, after following [1], I am not unable to understand when the > file config/arm/arm64_armv8_linuxapp_gcc gets used. Is this file > required?
If I understand it correctly, only for cross compiling on x86. distro folks build the generic image on arm64 with -Dmachine=default for arm64. > > 1. http://mails.dpdk.org/archives/dev/2019-January/123272.html
