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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable [AMD Official Use Only - AMD Internal Distribution Only] Hi Bruce, ________________________________ From: Bruce Richardson Sent: Monday, October 20, 2025 2:27 PM To: Tummala, Sivaprasad Cc: honnappa.nagarahalli@arm.com ; anatoly.bu= rakov@intel.com ; jerinj@marvell.com ; radu.nicolau@intel.com ; gakhil@marvell.= com ; cristian.dumitrescu@intel.com ; Yigit, Ferruh ; konstantin.ananyev@huaw= ei.com ; dev@dpdk.org Subject: Re: [PATCH v2] test/ring_perf: add optional cross L3 core selectio= n Caution: This message originated from an External Source. Use proper cautio= n when opening attachments, clicking links, or responding. On Sat, Oct 18, 2025 at 06:48:27AM +0000, Sivaprasad Tummala wrote: >> Enhances test_ring_perf to optionally select two cores on >> the same socket but on different L3 caches using hwloc. >> >> This allows performance characterization of ring library >> on processors with split L3 cache architectures, providing >> more realistic measurements of inter-core communication >> and cache effects. >> >> The feature is conditional on hwloc being present, ensuring >> builds succeed on systems without hwloc. >> >> Signed-off-by: Sivaprasad Tummala >> >> v2: >> * Localized hwloc dependency to test app only. >> * Optimized get_two_l3caches() by moving socket and L3 cache ID >> retrieval to the outer loop. >> --- >> app/meson.build | 8 ++++- >> app/test/test_ring_perf.c | 76 +++++++++++++++++++++++++++++++++++++++ >> 2 files changed, 83 insertions(+), 1 deletion(-) >> >> diff --git a/app/meson.build b/app/meson.build >> index 1798db3ae4..5443043f0c 100644 >> --- a/app/meson.build >> +++ b/app/meson.build >> @@ -46,6 +46,12 @@ if get_option('default_library') =3D=3D 'static' and = not is_windows >> default_ldflags +=3D ['-Wl,--export-dynamic'] >> endif >> >> +hwloc_dep =3D dependency('hwloc', required : false) >> +if hwloc_dep.found() >> + default_cflags +=3D ['-DHAVE_HWLOC=3D1'] >> + message('hwloc found =97 enabling L3 cache=96aware topology support') >> +endif >> + >> foreach app:apps >> name =3D app >> build =3D true >> @@ -60,7 +66,7 @@ foreach app:apps >> >> # use "deps" for internal DPDK dependencies, and "ext_deps" for >> # external package/library requirements >> - ext_deps =3D [] >> + ext_deps =3D [hwloc_dep] >> deps =3D [] >> >> if not enable_apps.contains(app) > >I still think we can limit this more. No need, for example, for test-pmd o= r >test-cmdline, for that matter, to depend on hwloc. Therefore, I'd suggest >moving the dependency code to app/test/meson.build and adding it there. > >/Bruce ACK! Will fix this in v3 --_000_CH3PR12MB8233E5E483D25DC3F463F89386F5ACH3PR12MB8233namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
[AMD Official Use Only - AMD Internal Distribution Only]

Hi Bruce, 
From: Bruce Richardson <bruce.richardson@intel.com>
Sent: Monday, October 20, 2025 2:27 PM
To: Tummala, Sivaprasad <Sivaprasad.Tummala@amd.com>
Cc: honnappa.nagarahalli@arm.com <honnappa.nagarahalli@arm.c= om>; anatoly.burakov@intel.com <anatoly.burakov@intel.com>; jerinj= @marvell.com <jerinj@marvell.com>; radu.nicolau@intel.com <radu.ni= colau@intel.com>; gakhil@marvell.com <gakhil@marvell.com>; cristian.dumitrescu@intel.com <cristian.dumitrescu@intel.com>; Yigit= , Ferruh <Ferruh.Yigit@amd.com>; konstantin.ananyev@huawei.com <ko= nstantin.ananyev@huawei.com>; dev@dpdk.org <dev@dpdk.org>
Subject: Re: [PATCH v2] test/ring_perf: add optional cross L3 c= ore selection

Caution: This mess= age originated from an External Source. Use proper caution when opening att= achments, clicking links, or responding.


On Sat, Oct 18, 2025 at 06:48:27AM +0000, Sivaprasad Tummala wrote:
>> Enhances test_ring_perf to optionally select two cores on
>> the same socket but on different L3 caches using hwloc.
>>
>> This allows performance characterization of ring library
>> on processors with split L3 cache architectures, providing
>> more realistic measurements of inter-core communication
>> and cache effects.
>> =
>> The feature is condition= al on hwloc being present, ensuring
>> builds succeed on system= s without hwloc.
>>
>> Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala@amd.com&g= t;
>>
>> v2:
>> * Localized hwloc dependency to test app only.
>> * Optimized get_two_l3caches() by moving socket and L3 cache ID >> retrieval to the outer loop.
>> ---
>>  app/meson.build       &nb= sp;   |  8 ++++-
>> app/test/test_ring_perf.c | 76 +++++++++++++++++++++++++++++++++++= ++++
>> 2 files changed, 83 insertions(+), 1 deletion(-)
>>
>> diff --git a/app/meson.build b/app/meson.build
>> index 1798db3ae4..5443043f0c 100644
>> --- a/app/meson.build
>> +++ b/app/meson.build
>> @@ -46,6 +46,12 @@ if get_option('default_library') =3D=3D 'static= ' and not is_windows
>>     default_ldflags +=3D ['-Wl,--export-dynamic'] >>  endif
>>
>> +hwloc_dep =3D dependency('hwloc', required : false)
>> +if hwloc_dep.found()
>> +  default_cflags +=3D ['-DHAVE_HWLOC=3D1']
>> +  message('hwloc found =97 enabling L3 cache=96aware topolog= y support')
>> +endif
>> +
>>  foreach app:apps
>>      name =3D app
>>      build =3D true
>> @@ -60,7 +66,7 @@ foreach app:apps
>>
>>      # use "deps" for internal DPDK depen= dencies, and "ext_deps" for
>>      # external package/library requirements
>> -    ext_deps =3D []
>> +    ext_deps =3D [hwloc_dep]
>>      deps =3D []
>>
>>      if not enable_apps.contains(app)
>
>I still think we can limit this more. No need, for example, for test-pm= d or
>test-cmdline, for that matter, to depend on hwloc. Therefore, I'd sugge= st
>moving the dependency code to app/test/meson.build and adding it there.=
>
>/Bruce

ACK! Will fix this= in v3 

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