stmmac/RTL8211F/Meson GXBB: TX throughput problems
André Roth
neolynx at gmail.com
Sat Sep 17 14:23:12 PDT 2016
Hi all,
I have an odroid c2 board which shows this issue. No data is
transmitted or received after a moment of intense tx traffic. Copying a
1GB file per scp from the board triggers it repeatedly.
The board has a stmmac - user ID: 0x11, Synopsys ID: 0x37.
When switching the network to 100Mb/s the copying does
not seam to trigger the issue.
I've attached the ethtool statistics before and after the problem.
Thanks for your help,
André
> Hi Alexandre,
>
> On Mon, Sep 12, 2016 at 6:37 PM, Alexandre Torgue
> <alexandre.torgue at 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
>
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>
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