Can I change maximum rx ring buffer number to bigger(ICE_MAX_NUM_DESC 8160)

[chenlong_2022]

product：

intel e810 100G bandwidth network interface

problem：

I have increased the size of Ethernet device rx ring buffer to 8160(ethtool -G), but when high packet rate arrives, tcpdump will show  loss a lot of packets, which is showed in rx dropped(ethtool -S ).

question：

i find in the ice-1.9.11 driver file, the max ring buffer is 8160

ice.h

#define ICE_MAX_NUM_DESC 8160

can i change it to a bigger number?

or

why is just exactly 8160 = 255 * 32？

best regards

[Caguicla_Intel]

Hello chenlong_2022,

Thank you for posting in Intel Ethernet Communities.

Please provide the following information that would help in checking your request. 

1. Exact model of e810 adapter. You may share the the PBA of the adapter. You may refer to the link below on where to find the PBA number. It consists 6-3 digit number located at the last part of the serial number. 

Identify Your Intel® Network Adapter Model Using PBA Number

https://www.intel.com/content/www/us/en/support/articles/000007022/network-and-i-o/ethernet-products.html

2. Current driver version

3. Exact Operating System used

Awaiting to your reply. 

Should there be no response from you, I’ll make sure to reach out after 3 business days. 

Best regards,

Crisselle C.

Intel® Customer Support

[chenlong_2022]

hi Crisselle

thank you for your reply!

1. Exact model of e810 adapter.

sorry about i can only get e810 information from remote ssh connection, it displays below

[root@localhost src]# lspci |grep 810
18:00.0 Ethernet controller: Intel Corporation Ethernet Controller E810-C for backplane (rev 02)

2. Current driver version

ice-1.9.11

[root@localhost ~]# ethtool -i enp134s0f1
driver: ice
version: 1.9.11
firmware-version: 2.30 0x80005d05 1.2877.0
expansion-rom-version:
bus-info: 0000:86:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

3. Exact Operating System used

CentOS 7.9

Awaiting to your reply. 

Best regards,

chenlong_2022

[Caguicla_Intel]

Hello chenlong_2022,

Thank you for providing the information requested. 

Please allow us to further check this query. We will give you an update as soon as possible but no later than 3 business days. 

Hoping for your kind patience. 

Best regards,

Crisselle C.

Intel® Customer Support

[Caguicla_Intel]

Hello chenlong_2022,

Thank you for the patience on this matter. 

Please see below feedback from our higher level support and let us know if you have questions or clarifications. 

The max RX Ring value for E810-XXVDA2 is only 8160. Unfortunately, you cannot set it to higher value.  You may also find this value ethtool -g [interface] command which you mentioned already on your initial post.

Looking forward to your reply. 

We will follow up after 3 business days in case we don't hear from you. 

Best regards,

Crisselle C.

Intel® Customer Support

[chenlong_2022]

hello Crisselle C.

thank you for your response.

I know that "The max RX Ring value for E810-XXVDA2 is only 8160"

Best regards

[Caguicla_Intel]

Hello chenlong_2022,

You're welcome. 

Unfortunately, you cannot set it to higher value since it is already the max RX Ring value. Please feel free to let us know if you have questions or clarifications and we will be glad to be of help. Otherwise, kindly confirm if we can now close this request. 

Awaiting to your reply. 

We will follow up after 3 business days in case we don't hear from you.

Best regards,

Crisselle C.

Intel® Customer Support

[Mike_Intel]

Hello chenlong_2022,

I hope you're having a wonderful day. We are just sending a soft follow up to check if you still have clarifications regarding this issue.

Awaiting to your reply. 

If you have questions, please let us know. In case we do not hear from you, we will make a follow up after 3 workings days. Thank you.

Best regards,

Michael L.

Intel® Customer Support

[Caguicla_Intel]

Hello chenlong_2022,

Good day!

Please be informed that we will now close this request since we haven't received any response from our previous follow ups. Just feel free to post a new question if you may have any other inquiry in the future as this thread will no longer be monitored.

Best regards,

Crisselle C.

Intel® Customer Support