port-sparc64/54035: Frequent of "cmdide0:0:0: lost interrupt" when transferring files to sparc64 Qemu guest

[thorpej%me.com@localhost]

>Number:         54035
>Category:       port-sparc64
>Synopsis:       Frequent of "cmdide0:0:0: lost interrupt" when transferring files to sparc64 Qemu guest
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sparc64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 02 23:50:00 +0000 2019
>Originator:     Jason Thorpe
>Release:        NetBSD 8.99.34 / NetBSD 8.0
>Organization:
>Environment:
eNetBSD sparc64-vm 8.99.34 NetBSD 8.99.34 (GENERIC) #0: Thu Feb 28 17:41:27 UTC 2019  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/sparc64/compile/GENERIC sparc64
>Description:
When transferring large files (distribution sets in this case) to a sparc64 Qemu guest using scp, I am setting frequent:

cmdide0:0:0: lost interrupt
[ 1406.4595499]         type: ata tc_bcount: 16384 tc_skip: 0

errors, resulting in periodic stalls.

I don't know if this is a NetBSD bug or a Qemu bug.
>How-To-Repeat:
Copy large files to a sparc64 Qemu guest.
>Fix:
unknown.