* [4.18.7] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
@ 2018-09-14 18:56 Johann Kieleich
0 siblings, 0 replies; only message in thread
From: Johann Kieleich @ 2018-09-14 18:56 UTC (permalink / raw)
To: linux-kernel
Hi,
not sure if this is the place to ask.
I'm getting a LOT of these messages:
[70679.212719] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
[70679.508107] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
[70679.779284] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
( 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) )
This happens while writing random data to an USB drive (Seagate Backup Plus 6TB).
# pv < /dev/urandom > /dev/usbdrive
The drive is new and I like to overwrite drives as a burn-in test, also as a pre-encryption wipe.
This runs fine for an hour or two (a hundred gigs), then speed drops by more than half,
'top' shows usb-storage process eating CPU, mouse pointer and keyboard get sluggish,
and then a while later, these console messages appear.
So far the only thing that has helped get things back in order (for a while)
is to reboot the machine entirely.
I've no idea where to even start tackling this problem.
Any suggestions?
Thank you
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