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Date:      Sun, 06 May 2018 07:30:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 208205] re0 watchdog timeout
Message-ID:  <bug-208205-7501-8r8O24myZw@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-208205-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-208205-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D208205

--- Comment #24 from zjk <zjk7@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 quic=
kly.=20
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 l=
oad
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 / b=
and
management.

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

--=20
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