[Bug 200026] em driver reports "Watchdog timeout -- resetting" on vmware ESXi
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bugzilla-noreply at freebsd.org
Thu May 7 12:43:50 UTC 2015
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200026
Bug ID: 200026
Summary: em driver reports "Watchdog timeout -- resetting" on
vmware ESXi
Product: Base System
Version: 10.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs at FreeBSD.org
Reporter: nick at foobar.org
the freebsd em driver periodically hangs when running in a VM on all versions
of esxi after (but not including) build 799733 (ESXi 5.0 GA). The symptoms of
the problem are that the freebsd vm drops traffic on the affected interface for
a period of time. The kernel reports errors:
Apr 22 19:12:08 xxxx kernel: em0: Watchdog timeout -- resetting
Apr 25 07:38:18 xxxx kernel: em0: Watchdog timeout -- resetting
Apr 27 23:29:35 xxxx kernel: em1: Watchdog timeout -- resetting
Apr 29 18:03:29 xxxx kernel: em1: Watchdog timeout -- resetting
May 5 05:28:38 xxxx kernel: em1: Watchdog timeout -- resetting
FreeBSD 8/9 were particularly badly affected by this, to the point that the em
driver was totally unusable on those versions when running as vm after esxi
build 799733, i.e ~30% packet loss for pings. The intel em driver update in
10.0 helped quite a bit, and anecdotally the problem seems to be less bad on
ESXi 6.0. Now the figure seems to be down at around 1-2% pktloss over extended
periods of time.
However it's still there on 10.1 with all recent versions of esxi, and prevents
freebsd from being able to function properly as a router when using the em
interface.
The problem also affects freebsd derivatives (e.g. some versions of JunOS
Firefly / vRR / vMX, etc).
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