Re: [dpdk-dev] [PATCH 0/4] Extend --lcores to run on cores > RTE_MAX_LCORE

[Kevin Traynor <ktraynor@redhat.com>]

On 09/06/2020 18:48, Luca Boccassi wrote:
> On Tue, 2020-06-09 at 16:30 +0000, Song, Keesang wrote:
>> [AMD Public Use]
>>
>> Hi Kevin and Luca,
>>

Hi Keesang

>> We are still waiting for the response.
>> Can you help on this for the backports in 18.11 and 19.11?
>> It would work for our customers even with changing the default value of ' CONFIG_RTE_MAX_LCORE' to 256 in common_base file in 18.11 and 19.11.
>>
>> Thanks,
>> Keesang
> 
> How to send patches for inclusion in LTS releases if not already
> backported is documented here:
> 
> https://core.dpdk.org/contribute/#send
> 
> If you do the work to backport and test, on the surface it seems fine
> to have those in 19.11.4
> 

Looks ok to me too. I can take this in 18.11, but it will need to be in
19.11 first. Please send a backport for 18.11 and test that it's working
as expected with the 18.11 branch.

thanks,
Kevin.

>> -----Original Message-----
>> From: Song, Keesang 
>> Sent: Monday, June 1, 2020 3:54 PM
>> To: Thomas Monjalon <thomas@monjalon.net>
>> Cc: David Marchand <david.marchand@redhat.com>; dev@dpdk.org; aconole@redhat.com; ferruh.yigit@intel.com; bluca@debian.org; ktraynor@redhat.com; bruce.richardson@intel.com; honnappa.nagarahalli@arm.com; drc@linux.vnet.ibm.com; stable@dpdk.org; Aman Kumar <aman.kumar@vvdntech.in>; Grimm, Jon <Jon.Grimm@amd.com>
>> Subject: RE: [dpdk-dev] [PATCH 0/4] Extend --lcores to run on cores > RTE_MAX_LCORE
>>
>> [AMD Public Use]
>>
>> Thanks Thomas for the response.
>> For a correction, the patchwork has not been submitted for the current LTS release, 19.11.2, but was merged into 20.02 and onward. 
>> The reason I brought this again was to address LTS users and many other application based on the LTS releases(18.11 & 19.11).
>> Since I found many of our customers and users are still relying on the latest LTS version, I'm seeking an aid for adding this change into at least 19.11, LTS branch.
>> We could argue that this is actually not a bug, in a way, it's inconvenient for Openstack or cloud deployed DPDK application since it's often inapt to change the base config and recompile the max lcore limit.
>> If backporting is still not a preferred way(pushing this patchwork into 19.11), then can we instead consider changing only the default value of ' CONFIG_RTE_MAX_LCORE' to 256 in common_base file?
>>
>> # Compile Environment Abstraction Layer
>> #
>> CONFIG_RTE_MAX_LCORE=128 --> 256
>>
>> I'd appreciate if anyone can advise me know what we can do about this to move forward.
>>
>> -----Original Message-----
>> From: Thomas Monjalon <thomas@monjalon.net>
>> Sent: Monday, June 1, 2020 2:23 PM
>> To: Song, Keesang <Keesang.Song@amd.com>
>> Cc: David Marchand <david.marchand@redhat.com>; dev@dpdk.org; aconole@redhat.com; ferruh.yigit@intel.com; bluca@debian.org; ktraynor@redhat.com; bruce.richardson@intel.com; honnappa.nagarahalli@arm.com; drc@linux.vnet.ibm.com; stable@dpdk.org
>> Subject: Re: [dpdk-dev] [PATCH 0/4] Extend --lcores to run on cores > RTE_MAX_LCORE
>>
>> [CAUTION: External Email]
>>
>> 29/05/2020 05:05, Song, Keesang:
>>> Hi Thomas & David,
>>>
>>> We haven't got the final status on this patch, and I don't see this change even from the latest LTS 20.04 repo.
>>> So I'd like to confirm whether this patch has been safely submitted to the main upstream.
>>> Can you check the status of that commit?
>>>
>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
>>> hwork.dpdk.org%2Fpatch%2F63507%2F&amp;data=02%7C01%7CKeesang.Song%40am
>>> d.com%7Cd71ea9aca917447dfb3e08d80671f34c%7C3dd8961fe4884e608e11a82d994
>>> e183d%7C0%7C0%7C637266433776198364&amp;sdata=1EgxevCILVMMLgyQC%2FzaWYJ
>>> XJ%2BOijs0Rtym1TA0VS28%3D&amp;reserved=0
>>
>> As you can see below, there is a pending question:
>>         "is it a new feature or a fix?"
>>
>> Kevin and Luca are the arbiters for the backports in 18.11 and 19.11.
>>
>>
>>> -----Original Message-----
>>> From: Thomas Monjalon <thomas@monjalon.net>
>>> Sent: Friday, February 21, 2020 12:04 AM
>>>
>>> Hi,
>>>
>>> 21/01/2020 01:24, Thomas Monjalon:
>>>> 02/12/2019 16:35, David Marchand:
>>>>> We are currently stuck with no option but recompile a DPDK if the 
>>>>> system has more cores than RTE_MAX_LCORE.
>>>>> A bit of a pity when you get a system with more than 200+ cores 
>>>>> and your testpmd has been built and packaged with RTE_MAX_LCORE == 128.
>>>>>
>>>>> The --lcores does not need to care about the underlying cores, 
>>>>> remove this limitation.
>>>>> David Marchand (4):
>>>>>   eal/windows: fix cpuset macro name
>>>>>   eal: do not cache lcore detection state
>>>>>   eal: display all detected cores at startup
>>>>>   eal: remove limitation on cpuset with --lcores
>>>>
>>>> The patches look good but it is very hard to review parsing code (last patch).
>>>> We will better experience corner cases after merging.
>>>>
>>>> Applied for -rc1, thanks
>>>
>>> This patch was merged in 20.02.
>>> We don't have any feedback about issues so it's probably working fine.
>>>
>>> It is solving a problem for running DPDK on machines having a lot of cores.
>>> Now the difficult question: is it a new feature or a fix?
>>> Should we backport this patchset?
>