[CentOS-virt] NIC Stability Problems Under Xen 4.4 / CentOS 6 / Linux 3.18

Tue Jan 24 13:29:39 UTC 2017
-=X.L.O.R.D=- <xlord.sl at gmail.com>

Kevin Stange,
It can be either kernel or update the NIC driver or firmware of the NIC
card. Hope that helps!

-----Original Message-----
From: CentOS-virt [mailto:centos-virt-bounces at centos.org] On Behalf Of Kevin
Sent: Tuesday, January 24, 2017 1:04 AM
To: centos-virt at centos.org
Subject: [CentOS-virt] NIC Stability Problems Under Xen 4.4 / CentOS 6 /
Linux 3.18

I have three different types of CentOS 6 Xen 4.4 based hypervisors (by
hardware) that are experiencing stability issues which I haven't been able
to track down.  All three types seem to be having issues with NIC and/or
PCIe.  In most cases, the issues are unrecoverable and require a hard boot
to resolve.  All have Intel NICs.

Often the systems will remain stable for days or weeks, then suddenly
encounter one of these issues.  I have yet to tie the error to any specific
action on the systems and can't reproduce it reliably.

- Supermicro X8DT3, Dual Xeon E5620, 2x 82575EB NICs, 2x 82576 NICs

Kernel messages upon failure:

pcieport 0000:00:03.0: AER: Multiple Corrected error received: id=0018
pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Transaction
Layer, id=0018(Receiver ID)
pcieport 0000:00:03.0:   device [8086:340a] error
pcieport 0000:00:03.0:    [13] Advisory Non-Fatal
pcieport 0000:00:03.0:   Error of this Agent(0018) is reported first
igb 0000:04:00.0: PCIe Bus Error: severity=Corrected, type=Physical Layer,
id=0400(Receiver ID)
igb 0000:04:00.0:   device [8086:10a7] error status/mask=00002001/00002000
igb 0000:04:00.0:    [ 0] Receiver Error         (First)
igb 0000:04:00.1: PCIe Bus Error: severity=Corrected, type=Physical Layer,
id=0401(Receiver ID)
igb 0000:04:00.1:   device [8086:10a7] error status/mask=00002001/00002000
igb 0000:04:00.1:    [ 0] Receiver Error         (First)

This spams to the console continuously until hard booting.

- Supermicro X9DRD-iF/LF, Dual Xeon E5-2630, 2x I350, 2x 82575EB

igb 0000:82:00.0: Detected Tx Unit Hang
 Tx Queue             <1>
 TDH                  <43>
 TDT                  <50>
 next_to_use          <50>
 next_to_clean        <43>
 time_stamp           <12e6bc0b6> next_to_watch        <ffff880006aa7440>
 jiffies              <12e6bc8dc>
 desc.status          <1c8210>

This spams to the console continuously until hard booting.

- Supermicro X9DRT, Dual Xeon E5-2650, 2x I350, 2x 82571EB

e1000e 0000:04:00.0 eth2: Detected Hardware Unit Hang:
  TDH                  <ff>
  TDT                  <33>
  next_to_use          <33>
  next_to_clean        <fd>
  time_stamp           <138230862>
  next_to_watch        <ff>
  jiffies              <138231ac0>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3c00>
PHY Extended Status    <3000>
PCI Status             <10>

This type of system, the NIC automatically recovers and I don't need to

So far I tried using pcie_aspm=off to see that would help, but it appears
that the 3.18 kernel turns off ASPM by default on these due to probing the
BIOS.  Stability issues were not resolved by the changes.

On the latter system type I also turned off all offloading setting.  It
appears the stability increased slightly but it didn't fully resolve the
problem.  I haven't adjusted offload settings on the first two server types

I suspect this problem is related to the 3.18 kernel used by the virt SIG,
as we had these running Xen on CentOS 5's kernel with no issues for years,
and systems of these types used elsewhere in our facility are stable under
CentOS 6's standard kernel.  This affects more than one server of each type,
so I don't believe it is a hardware failure, or else it's a hardware design

Has anyone experienced similar issues with this configuration, and if so,
does anyone have tips on how to resolve the issues?

Kevin Stange
Chief Technology Officer
Steadfast | Managed Infrastructure, Datacenter and Cloud Services
800 S Wells, Suite 190 | Chicago, IL 60607
312.602.2689 X203 | Fax: 312.602.2688
kevin at steadfast.net | www.steadfast.net
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