How can i adjust buffer size?

For Developers
1

Hi, all!
I'm testing tcp congestion control algorithm cubic with my openwrt router.
I want to see changes of throughput as adjusting buffer size. So, I did "ethtool -G eth0 rx 32 tx 32", however, there are no any changes of throughput. (The tx, rx ring buffer size were changed. because when i typed "ethtool -g eth0", it printed "... RX: 32, TX: 32 ...")

I want to adjust buffer size, and then want to check the throughput changes. How can i adjust router's buffer?

2

Is this also related to MTU?

Not that I know know, I am just asking, hoping some experienced person can answer.

I am also interested in the answers.

3

I since read, MTU is not buffer size.