Adjusting rx_buff

Purpose

The current tuning method applies only to the Hi1822 NIC.

The default value of rx_buff of the Hi1822 NIC is 2 KB. When 64 KB packets are aggregated, multiple inconsecutive memory blocks are required, resulting in low memory usage. This parameter can be set to 2, 4, 8 or 16 KB to reduce discontinuous memory blocks and improve memory usage.

Procedure

1. Check the value of rx_buff. The default value is 2. If the value is not 8, change the value by performing 2. If the value is 8, perform 3.

   1	cat /sys/bus/pci/drivers/hinic/module/parameters/rx_buff

2. Add the hinic.conf file to the /etc/modprobe.d/ directory and change the value of rx_buff to 8.
   1. Go to the directory.

      cd /etc/modprobe.d

   2. Create a file.

      vi hinic.conf

   3. Press i to enter the insert mode and add the following content to the file:

      options hinic rx_buff=8

   4. Press Esc, type :wq!, and press Enter to save the file and exit.
3. Mount the hinic driver again for the new parameters to take effect.

   1 2	rmmod hinic modprobe hinic

4. Check whether the rx_buff parameter is updated successfully.

   1	cat /sys/bus/pci/drivers/hinic/module/parameters/rx_buff

   If 8 is returned, the update is successful.