On Sat, Jul 25, 2020 at 7:08 PM Han <keepsim...@gmail.com> wrote:
>
> My apologies if this is not the right place to ask this question.
>
> I'm trying to use UDP GSO to improve the throughput. My testing shows
> that UDP GSO works with the local server (i.e. loopback interface) but
> fails with a remote server (in WLAN, via wlan0 interface).
>
> My question is: do I need to explicitly enable UDP GSO for wlan0
> interface? If yes, how do I do it? I searched online but could not
> find a good answer. I looked at "ethtool" but not clear which option
> to use:
>
> $ ethtool --show-offload wlan0 | grep -i generic-segment
> generic-segmentation-offload: off [requested on]
Which wireless driver does your device use. Does it have tx checksum offload?
That is a hard requirement. In udp_send_skb:
if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
dst_xfrm(skb_dst(skb))) {
kfree_skb(skb);
return -EIO;
}
> $ ethtool --show-offload wlan0 | grep -i udp-segment
> tx-udp-segmentation: off [fixed]
This is hardware segmentation offload. It is not required.
