Re: [dpdk-dev] [PATCH v4] build: add meson options of max_memseg_lists and atomic_mbuf_ref_counts

[kefu chai <tchaikov@gmail.com>]

hello Bruce,

do you have any further concerns? is there anything i can do to move
this forward?

cheers,

On Thu, Sep 9, 2021 at 12:51 AM Kefu Chai <tchaikov@gmail.com> wrote:
>
> RTE_MAX_MEMSEG_LISTS = 128 is not enough for high-memory machines, in our
> case, we need to increase it to 8192. so add an option so user can
> override it. RTE_MBUF_REFCNT_ATOMIC = 0 is not necessary for applications
> like Seastar, where it's safe to assume that the mbuf refcnt is only
> updated by a single core only.
>
> ---
>
> v4:
>
> fix the coding style issue by reduce the line length to under 75.
> this change should silence the warning like:
>
> WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
> #81:
> RTE_MAX_MEMSEG_LISTS = 128 is not enough for high-memory machines, in our case,
>
> total: 0 errors, 1 warnings, 35 lines checked
>
> Signed-off-by: Kefu Chai <tchaikov@gmail.com>
> ---
>  config/meson.build  | 5 ++++-
>  config/rte_config.h | 2 --
>  meson_options.txt   | 4 ++++
>  3 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/config/meson.build b/config/meson.build
> index 3b5966ec2f..d95dccdbcc 100644
> --- a/config/meson.build
> +++ b/config/meson.build
> @@ -301,7 +301,10 @@ if dpdk_conf.get('RTE_ARCH_64')
>  else # for 32-bit we need smaller reserved memory areas
>      dpdk_conf.set('RTE_MAX_MEM_MB', 2048)
>  endif
> -
> +dpdk_conf.set('RTE_MAX_MEMSEG_LISTS', get_option('max_memseg_lists'))
> +if get_option('atomic_mbuf_ref_counts')
> +  dpdk_conf.set('RTE_MBUF_REFCNT_ATOMIC', true)
> +endif
>
>  compile_time_cpuflags = []
>  subdir(arch_subdir)
> diff --git a/config/rte_config.h b/config/rte_config.h
> index 590903c07d..0a659f5e1a 100644
> --- a/config/rte_config.h
> +++ b/config/rte_config.h
> @@ -29,7 +29,6 @@
>
>  /* EAL defines */
>  #define RTE_MAX_HEAPS 32
> -#define RTE_MAX_MEMSEG_LISTS 128
>  #define RTE_MAX_MEMSEG_PER_LIST 8192
>  #define RTE_MAX_MEM_MB_PER_LIST 32768
>  #define RTE_MAX_MEMSEG_PER_TYPE 32768
> @@ -50,7 +49,6 @@
>
>  /* mbuf defines */
>  #define RTE_MBUF_DEFAULT_MEMPOOL_OPS "ring_mp_mc"
> -#define RTE_MBUF_REFCNT_ATOMIC 1
>  #define RTE_PKTMBUF_HEADROOM 128
>
>  /* ether defines */
> diff --git a/meson_options.txt b/meson_options.txt
> index 0e92734c49..6aeae211cd 100644
> --- a/meson_options.txt
> +++ b/meson_options.txt
> @@ -38,6 +38,10 @@ option('max_lcores', type: 'integer', value: 128, description:
>         'maximum number of cores/threads supported by EAL')
>  option('max_numa_nodes', type: 'integer', value: 32, description:
>         'maximum number of NUMA nodes supported by EAL')
> +option('max_memseg_lists', type: 'integer', value: 128, description:
> +       'maximum number of dynamic arrays holding memsegs')
> +option('atomic_mbuf_ref_counts', type: 'boolean', value: true, description:
> +       'atomically access the mbuf refcnt')
>  option('platform', type: 'string', value: 'native', description:
>         'Platform to build, either "native", "generic" or a SoC. Please refer to the Linux build guide for more information.')
>  option('enable_trace_fp', type: 'boolean', value: false, description:
> --
> 2.33.0
>


-- 
Regards
Kefu Chai