Bug 201735 - serial8250: too much work for irq4
Summary: serial8250: too much work for irq4
Status: NEW
Alias: None
Product: Networking
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 high
Assignee: Stephen Hemminger
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-11-20 07:09 UTC by romas
Modified: 2018-11-20 07:09 UTC (History)
0 users

See Also:
Kernel Version: 4.4.0-116-generic
Subsystem:
Regression: No
Bisected commit-id:

Attachments
LSHW log (53.88 KB, text/plain)
2018-11-20 07:09 UTC, romas 		Details
Add an attachment (proposed patch, testcase, etc.)

Description romas 2018-11-20 07:09:26 UTC 
Created attachment 279549 [details]
LSHW log

Virtual machines loosing network access randomly. What happens when issue is present:

 - Network device on guest machine is lost. It's impossible to access machine.
 - Virsh console available for connection. PING from affected guest is available but with massive packet loss (20% ~ 70%).
 - Networking restart from the guest does not resolve problem.
 - When virsh  editing and setting to: <cpu mode='host-passthrough'/> issue seems to be resolved (after reboot).

Such issue observed on SUPERMICRO server. LSHW report attached.
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