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SubjectARM: imx6q fec watchdog timeout with TX ring dump
Hello everyone,


I've been playing around with a Utilite Pro recently. It features a
Freescale imx6q with SoC FEC as eth0 and a second ether Intel I211
interface on PCIE being mapped to eth1 amongst various other bits.

ATM, it's running debian jessie and kernel 3.16.1 with the recent three
patch sets from Russell King at
http://ftp.arm.linux.org.uk/cgit/linux-arm.git/log/?h=fec-testing; from
the tag imx-drm-fixes-urgent to fec-testing, minus the "clear IPV6
header CS".

During normal operation, I have had the occasional FEC Watchdog Timeout
(FWT). However, when eth0 und eth1 are bonded to balance-rr mode and two
independent iperfs cliented by different machines with each 4 threads
run free on the Utilite, it inevitably comes to FWTs. Raising
packets_per_slave to four seems to help somewhat.

The bond is routed through two aggregated (trunk) ports on a Netgear
JGS524E running to the iperf clients.


Drop me a line, if you need more information.


TIA,

John


[1] Patch set A:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/270173.html
[2] Patch set B:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/270373.html
[3] Patch set C:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/270393.html
[4] Linux bonding documentation
https://www.kernel.org/doc/Documentation/networking/bonding.txt
[5] Utilite Pro product page
http://utilite-computer.com/web/utilite-pro-specifications
[6] Utilite Pro bonding configuration http://www.utilite-co
mputer.com/forum/viewtopic.php?f=73&t=1980&sid=31eb3a1273da28916d665112f8af2350
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