[PATCH] net: increase the maximum of RX/TX descriptors

[Lukáš Šišmiš]

On 29. 10. 24 15:37, Morten Brørup wrote:
>> From: Lukas Sismis [mailto:sismis at cesnet.cz]
>> Sent: Tuesday, 29 October 2024 13.49
>>
>> Intel PMDs are capped by default to only 4096 RX/TX descriptors.
>> This can be limiting for applications requiring a bigger buffer
>> capabilities. The cap prevented the applications to configure
>> more descriptors. By bufferring more packets with RX/TX
>> descriptors, the applications can better handle the processing
>> peaks.
>>
>> Signed-off-by: Lukas Sismis <sismis at cesnet.cz>
>> ---
> Seems like a good idea.
>
> Have the max number of descriptors been checked with the datasheets for all the affected NIC chips?
>
I was hoping to get some feedback on this from the Intel folks.

But it seems like I can change it only for ixgbe (82599) to 32k 
(possibly to 64k - 8), others - ice (E810) and i40e (X710) are capped at 
8k - 32.

I neither have any experience with other drivers nor I have them 
available to test so I will let it be in the follow-up version of this 
patch.

Lukas