On Sun, Jul 26, 2020 at 2:18 PM Han <keepsim...@gmail.com> wrote: > > On Sun, Jul 26, 2020 at 6:42 AM Willem de Bruijn > <willemdebruijn.ker...@gmail.com> wrote: > > > > 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? > > It seems to be "brcmfmac" : > > $ readlink /sys/class/net/wlan0/device/driver > ../../../../../../../../bus/sdio/drivers/brcmfmac > > I think tx checksum offload is off, and I couldn't turn it on. Does > "[fixed]" mean it cannot be changed?
Indeed. That explains it.
