[Bug 166724] [re] if_re watchdog timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=166724

--- Comment #25 from zjk <zjk7 at wp.pl> ---
hw.re.msi_disable hw.re.msix_disable
I tested this solution for a few days (it already exists somewhere on the
internet).
There is no visible effect (on my computers) - network is closing very quickly. 
But - maybe it depends on the network card chipset?

However, I highly recommend the analysis:
https://forums.freebsd.org/threads/10-2-release-re0-watchdog-timeout.55306/#post-337045
There are some extremely important remarks.
One important tip - this may be the result of overloading the processor. In
general - a problem for low-performance processors. Or vice versa: for the
"computationally demanding" chipset of the network card, and finally the
"programmatically extended" driver.

Probably because the version of "built-in" driver for FreeBSD is so much
"slimmed", in relation to the full version from Realtek (from the Realtek
website). It may be intended to run on less-efficient processors.

But I can not fully appreciate everything from this analysis. "Watchdog
timeout" messages - also occur after stopping the transmission. Processor load
drops to several percent, but watchdog timeout messages still appear every few
seconds.

In general - a reset is needed to restore the normal operation of the
interface.

As a solution, you can use "patch" - instead of, for example, limit the
connection speed to 100 Mb, you can use, for example, dummynet for flow / band
management.

It is still not a solution to the problem of the driver itself.

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