Hi Alexandre, On Mon, Sep 12, 2016 at 6:37 PM, Alexandre Torgue <alexandre.tor...@st.com> wrote: > Which Synopsys IP version do you use ? found this in a dmesg log: [ 1.504784] stmmac - user ID: 0x11, Synopsys ID: 0x37 [ 1.509785] Ring mode enabled [ 1.512796] DMA HW capability register supported [ 1.517286] Normal descriptors [ 1.520565] RX Checksum Offload Engine supported [ 1.525219] COE Type 2 [ 1.527638] TX Checksum insertion supported [ 1.531862] Wake-Up On Lan supported [ 1.535483] Enable RX Mitigation via HW Watchdog Timer [ 1.543851] libphy: stmmac: probed [ 1.544025] eth0: PHY ID 001cc916 at 0 IRQ POLL (stmmac-0:00) active [ 1.550321] eth0: PHY ID 001cc916 at 7 IRQ POLL (stmmac-0:07)
>> Gbit ethernet on my device is provided by a Realtek RTL8211F RGMII PHY. >> Similar issues were reported in #linux-amlogic by a user with an >> Odroid C2 board (= similar hardware). >> >> The symptoms are: >> Receiving data is plenty fast (I can max out my internet connection >> easily, and with iperf3 I get ~900Mbit/s). >> Transmitting data from the device is unfortunately very slow, traffic >> sometimes even stalls completely. >> >> I have attached the iperf results and the output of >> /sys/kernel/debug/stmmaceth/eth0/descriptors_status. >> Below you can find the ifconfig, netstat and stmmac dma_cap info >> (*after* I ran all tests). >> >> The "involved parties" are: >> - Meson GXBB specific network configuration registers (I have have >> double-checked them with the reference drivers: everything seems fine >> here) >> - stmmac: it seems that nobody else has reported these kind of issues >> so far, however I'd still like to hear where I should enable some >> debugging bits to rule out any stmmac bug > > > On my side, I just tested on the same "kind" of system: > -SYNOPSYS GMAC 3.7 > -RTL8211EG as PHY > > With I perf, I reach: > -RX: 932 Mbps > -TX: 820Mbps > > Can you check ethtool -S eth0 (most precisely "MMC"counter and errors) ? > Which kernel version do you use ? I am using a 4.8.0-rc4 kernel, based on Kevin's "integration" branch: [0] Unfortunately I don't have access to my device in the next few days, but I'll keep you updated once I have the ethtool output. Thanks for your time Regards, Martin [0] https://git.kernel.org/cgit/linux/kernel/git/khilman/linux-amlogic.git/log/?h=v4.8/integ
