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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Subject: Re: [dpdk-dev] [PATCH 00/12] rxq q_errors[] statistics fixes
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On 4/12/2019 4:45 PM, Thomas Monjalon wrote:
> 12/04/2019 17:38, Ferruh Yigit:
>> On 4/12/2019 4:07 PM, Thomas Monjalon wrote:
>>> 11/03/2019 18:22, Ferruh Yigit:
>>>> On 3/4/2019 11:18 AM, David Marchand wrote:
>>>>> According to the api, the q_errors[] per queue statistic is for reception
>>>>> errors not transmit errors.
>>>>> This is a first cleanup on statistics before looking at oerrors.
>>>>>
>>>>
>>>> Yes, the patchset looks aligned with the API documentation [1].
>>>>
>>>> What can be the solution after cleanup? We can merge this cleanup and solution
>>>> next to each-other to not leave a gap?
>>>
>>> I think we should merge those fixes in 19.05-rc2.
>>>
>>> It seems there is a lot more work to achieve on stats, so better
>>> to start without waiting for the full picture.
>>>
>>
>> The problem is "q_errors" is available only for Rx queues, and David's patch is
>> preventing drivers to put Tx error stats into "q_errors" field.
>>
>> But it is clear that there is a need for a field for Tx queues errors. David has
>> another patch to using xstats for this. But I believe xstats is making solution
>> confusing, and now approach is unbalanced for Rx and Tx queues.
>>
>> I am for adding a new field for Tx queues "q_errors", and this will make getting
>> stats and David's patch very simple.
>>
>> The problem with the new fields is it breaks the ABI, but we already increased
>> the ABIVER for ethdev this release, I believe this is very good timing for this fix.
> 
> If changing the stats API, we should increase the number of stats per queue:
> 	#define RTE_ETHDEV_QUEUE_STAT_CNTRS 16
> What about 128 queues per port? 256?

We have 5 uint64_t using this [1], it will be 6 if we add new one.
So having 256 queues, will cost 12K memory, this is not a big number.

Is there any other concern of having large array other than possible memory waste?

[1]
uint64_t q_ipackets[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_opackets[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_ibytes[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_obytes[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_errors[RTE_ETHDEV_QUEUE_STAT_CNTRS];

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Subject: Re: [dpdk-dev] [PATCH 00/12] rxq q_errors[] statistics fixes
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On 4/12/2019 4:45 PM, Thomas Monjalon wrote:
> 12/04/2019 17:38, Ferruh Yigit:
>> On 4/12/2019 4:07 PM, Thomas Monjalon wrote:
>>> 11/03/2019 18:22, Ferruh Yigit:
>>>> On 3/4/2019 11:18 AM, David Marchand wrote:
>>>>> According to the api, the q_errors[] per queue statistic is for reception
>>>>> errors not transmit errors.
>>>>> This is a first cleanup on statistics before looking at oerrors.
>>>>>
>>>>
>>>> Yes, the patchset looks aligned with the API documentation [1].
>>>>
>>>> What can be the solution after cleanup? We can merge this cleanup and solution
>>>> next to each-other to not leave a gap?
>>>
>>> I think we should merge those fixes in 19.05-rc2.
>>>
>>> It seems there is a lot more work to achieve on stats, so better
>>> to start without waiting for the full picture.
>>>
>>
>> The problem is "q_errors" is available only for Rx queues, and David's patch is
>> preventing drivers to put Tx error stats into "q_errors" field.
>>
>> But it is clear that there is a need for a field for Tx queues errors. David has
>> another patch to using xstats for this. But I believe xstats is making solution
>> confusing, and now approach is unbalanced for Rx and Tx queues.
>>
>> I am for adding a new field for Tx queues "q_errors", and this will make getting
>> stats and David's patch very simple.
>>
>> The problem with the new fields is it breaks the ABI, but we already increased
>> the ABIVER for ethdev this release, I believe this is very good timing for this fix.
> 
> If changing the stats API, we should increase the number of stats per queue:
> 	#define RTE_ETHDEV_QUEUE_STAT_CNTRS 16
> What about 128 queues per port? 256?

We have 5 uint64_t using this [1], it will be 6 if we add new one.
So having 256 queues, will cost 12K memory, this is not a big number.

Is there any other concern of having large array other than possible memory waste?

[1]
uint64_t q_ipackets[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_opackets[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_ibytes[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_obytes[RTE_ETHDEV_QUEUE_STAT_CNTRS];
uint64_t q_errors[RTE_ETHDEV_QUEUE_STAT_CNTRS];