[PATCH] net/i40e: reduce the ITR interval of multi-driver mode

[PATCH] net/i40e: reduce the ITR interval of multi-driver mode

[Qiming Yang]

This patch change the interrupt interval from 8160us to 32us
to improve the performance of multi-driver mode.

Signed-off-by: Qiming Yang <qiming.yang@intel.com>
---
 drivers/net/i40e/i40e_ethdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index fe943a45ff..7c4cc44a27 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -1497,7 +1497,7 @@ i40e_calc_itr_interval(bool is_pf, bool is_multi_drv)
 	uint16_t interval = 0;
 
 	if (is_multi_drv) {
-		interval = I40E_QUEUE_ITR_INTERVAL_MAX;
+		interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
 	} else {
 		if (is_pf)
 			interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
-- 
2.25.1

RE: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode

[Zhang, Qi Z]

> -----Original Message-----
> From: Qiming Yang <qiming.yang@intel.com>
> Sent: Friday, December 16, 2022 11:12 AM
> To: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>
> Cc: Yang, Qiming <qiming.yang@intel.com>
> Subject: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode
> 
> This patch change the interrupt interval from 8160us to 32us to improve the
> performance of multi-driver mode.
> 
> Signed-off-by: Qiming Yang <qiming.yang@intel.com>

Acked-by: Qi Zhang <qi.z.zhang@intel.com>

Applied to dpdk-next-net-intel.

The patch also looks good for backporting, so added Cc stable tag.

Thanks
Qi


> ---
>  drivers/net/i40e/i40e_ethdev.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
> index fe943a45ff..7c4cc44a27 100644
> --- a/drivers/net/i40e/i40e_ethdev.h
> +++ b/drivers/net/i40e/i40e_ethdev.h
> @@ -1497,7 +1497,7 @@ i40e_calc_itr_interval(bool is_pf, bool is_multi_drv)
>  	uint16_t interval = 0;
> 
>  	if (is_multi_drv) {
> -		interval = I40E_QUEUE_ITR_INTERVAL_MAX;
> +		interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
>  	} else {
>  		if (is_pf)
>  			interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
> --
> 2.25.1

Re: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode

[Kevin Traynor]

On 26/12/2022 05:50, Zhang, Qi Z wrote:
> 
> 
>> -----Original Message-----
>> From: Qiming Yang <qiming.yang@intel.com>
>> Sent: Friday, December 16, 2022 11:12 AM
>> To: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>
>> Cc: Yang, Qiming <qiming.yang@intel.com>
>> Subject: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode
>>
>> This patch change the interrupt interval from 8160us to 32us to improve the
>> performance of multi-driver mode.
>>
>> Signed-off-by: Qiming Yang <qiming.yang@intel.com>
> 
> Acked-by: Qi Zhang <qi.z.zhang@intel.com>
> 
> Applied to dpdk-next-net-intel.
> 
> The patch also looks good for backporting, so added Cc stable tag.
> 

Hi. This looks like it is not fixing anything and it is changing a 
behaviour, so I won't take for 21.11.4.

thanks,
Kevin.

> Thanks
> Qi
> 
> 
>> ---
>>   drivers/net/i40e/i40e_ethdev.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
>> index fe943a45ff..7c4cc44a27 100644
>> --- a/drivers/net/i40e/i40e_ethdev.h
>> +++ b/drivers/net/i40e/i40e_ethdev.h
>> @@ -1497,7 +1497,7 @@ i40e_calc_itr_interval(bool is_pf, bool is_multi_drv)
>>   	uint16_t interval = 0;
>>
>>   	if (is_multi_drv) {
>> -		interval = I40E_QUEUE_ITR_INTERVAL_MAX;
>> +		interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
>>   	} else {
>>   		if (is_pf)
>>   			interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
>> --
>> 2.25.1
> 

RE: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode

[Zhang, Qi Z]

> -----Original Message-----
> From: Kevin Traynor <ktraynor@redhat.com>
> Sent: Thursday, February 23, 2023 12:49 AM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>; Yang, Qiming
> <qiming.yang@intel.com>; dev@dpdk.org; Xing, Beilei
> <beilei.xing@intel.com>; Xueming(Steven) Li <xuemingl@nvidia.com>; Luca
> Boccassi <bluca@debian.org>
> Subject: Re: [PATCH] net/i40e: reduce the ITR interval of multi-driver mode
> 
> On 26/12/2022 05:50, Zhang, Qi Z wrote:
> >
> >
> >> -----Original Message-----
> >> From: Qiming Yang <qiming.yang@intel.com>
> >> Sent: Friday, December 16, 2022 11:12 AM
> >> To: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>
> >> Cc: Yang, Qiming <qiming.yang@intel.com>
> >> Subject: [PATCH] net/i40e: reduce the ITR interval of multi-driver
> >> mode
> >>
> >> This patch change the interrupt interval from 8160us to 32us to
> >> improve the performance of multi-driver mode.
> >>
> >> Signed-off-by: Qiming Yang <qiming.yang@intel.com>
> >
> > Acked-by: Qi Zhang <qi.z.zhang@intel.com>
> >
> > Applied to dpdk-next-net-intel.
> >
> > The patch also looks good for backporting, so added Cc stable tag.
> >
> 
> Hi. This looks like it is not fixing anything and it is changing a behaviour, so I
> won't take for 21.11.4.

This comes from customer issue, it does fix for the usage when latency is critical, will be nice if it can be applied, thanks.

> 
> thanks,
> Kevin.
> 
> > Thanks
> > Qi
> >
> >
> >> ---
> >>   drivers/net/i40e/i40e_ethdev.h | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/i40e/i40e_ethdev.h
> >> b/drivers/net/i40e/i40e_ethdev.h index fe943a45ff..7c4cc44a27 100644
> >> --- a/drivers/net/i40e/i40e_ethdev.h
> >> +++ b/drivers/net/i40e/i40e_ethdev.h
> >> @@ -1497,7 +1497,7 @@ i40e_calc_itr_interval(bool is_pf, bool
> is_multi_drv)
> >>   	uint16_t interval = 0;
> >>
> >>   	if (is_multi_drv) {
> >> -		interval = I40E_QUEUE_ITR_INTERVAL_MAX;
> >> +		interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
> >>   	} else {
> >>   		if (is_pf)
> >>   			interval = I40E_QUEUE_ITR_INTERVAL_DEFAULT;
> >> --
> >> 2.25.1
> >