> > > We have several issues on the rk3328. > > > > > > The first issue, which you describe as the ssh lag, is the > > > tx-offload issue. > > > Packets that are larger than the MTU and will be fragmented break if > > > tx-offload is enabled. > > > To fix this, you must somehow disable tx-offload. > > > force-thresh-dma-mode disabled tx-offload, but had other side effects. > > > Ayufan's patch disables tx-offload only if the packet is larger than > > > 1498. > > > You can also disable tx-offload from userspace with ethtool. > > > > > > The second issue is the high rate of tx packets being corrupted, > > > which my patch to set the tx pull values fixes. > > > > > > The third issue is the tx and rx delays need to be tuned now that > > > the tx packet corruption issue has been fixed. > > > > > > I hope this clears things up a little for you. > > > > Yup, that's what I have in my mind already. My previous comment wasn't > > clear, I know. > > I pieced it together after your dma-mode patch, because that one fixed > > the ssh lag. > > My previous email was just what I saw after those changes. > > > > In my case the link reset still happens with your patch. > > > > You're thinking that the combination of your patch, ayufan's > > "conditional" patch and a specific tweak in the delays would work for > > the network instability problem? > > > > Correct, the link-reset tends to happen when the delays are at the edge of > working. > There is also the possibility that board level manufacturing tolerances are > causing issues where the delay can change between boards. > If this is the case, we will have to make an auto-tune function, probably > based off the mmc version. So, I tried just your patch with archlinuxARM linux 5.0 (meaning the tx/rx_delays are 0x25/0x11 respectively if I'm not mistaken) and disabled tx offload through ethtool. After 3 30-second iperf3 tests, no link resets! I get about the same speed you mentioned before, 800-something to 700-something lowest. Seems like the delays that are already there in the dts are better than the ones I picked up from the Armbian dts. It's worth noting that I've never noticed a link reset in my ~3 months of using the 4.4 Rockchip kernel that Armbian packages using ayufan's linux-kernel repo. Maybe something there? All in all, it does seem to be much better with your patch. _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
