Bug 203607 - AMD IOMMU BCM 5762 watchdog timeout under heavy traffic
Summary: AMD IOMMU BCM 5762 watchdog timeout under heavy traffic
Status: NEW
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: x86-64 (show other bugs)
Hardware: All Linux
: P1 high
Assignee: platform_x86_64@kernel-bugs.osdl.org
Depends on:
Reported: 2019-05-14 20:17 UTC by Elmar Melcher
Modified: 2019-05-17 21:26 UTC (History)
2 users (show)

See Also:
Kernel Version: starting 4.8-rc1 up to including 5.1.1
Tree: Mainline
Regression: No

/var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04 (42.60 KB, text/plain)
2019-05-14 20:17 UTC, Elmar Melcher

Description Elmar Melcher 2019-05-14 20:17:10 UTC
Created attachment 282761 [details]
/var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04

Copying a big file (300MB) over ethernet to the computer causes loss of connection for more than 8 seconds.
computer: HP EliteDesk 705 G3 (AMD cpu)
Ethernet controller: Broadcom Limited NetXtreme BCM5762 Gigabit Ethernet PCIe (rev 10) 14e4:1687 running at 1000Mb/s
Kernel bisect leads to
[256e4621c21aa1bf704e1a12e643923fdb732d04] iommu/amd: Make use of the generic IOVA allocator
as cause.
Attached /var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04.
Problem occurs on all subsequent kernel versions tested, including 5.1.1
Comment 1 Elmar Melcher 2019-05-14 20:26:47 UTC
probably related to
Comment 2 Elmar Melcher 2019-05-17 21:26:51 UTC
Trying to revert commit 256e4621c21aa1bf704e1a12e643923fdb732d04 in version 4.8-rc1 crashed during boot with DMA error at tg3 startup (tg3 is the driver for BCM5762).
Until somebody gives me some useful input I will give up on this and use 4.4 longterm, which is not affected by this bug.

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