Sudden slowdown of ARM emulation in master

[Niek Linnenbank <nieklinnenbank@gmail.com>]

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Hello Igor and Paolo,

Just now I was working on some small fixes for the cubieboard machine and
rebasing my Allwinner H3 branches.
While doing some testing, I noticed that suddenly the machines were much
slower than before.
I only see this happening when I rebase to this commit:
   ca6155c0f2bd39b4b4162533be401c98bd960820 ("Merge tag 'patchew/
20200219160953.13771-1-imammedo@redhat.com' of
https://github.com/patchew-project/qemu into HEAD")

Also the avocado tests I'm running started to timeout:

+ AVOCADO_ALLOW_LARGE_STORAGE=yes avocado --show=app,console run -t
machine:cubieboard tests/acceptance/boot_linux_console.py
...
(1/2)
tests/acceptance/boot_linux_console.py:BootLinuxConsole.test_arm_cubieboard_initrd:
|console: Uncompressing Linux... done, booting the kernel.
|console: Booting Linux on physical CPU 0x0
console: Linux version 4.20.7-sunxi (root@armbian.com) (gcc version 7.2.1
20171011 (Linaro GCC 7.2-2017.11)) #5.75 SMP Fri Feb 8 09:02:10 CET 2019
console: CPU: ARMv7 Processor [410fc080] revision 0 (ARMv7), cr=50c5387d
console: CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing
instruction cache
console: OF: fdt: Machine model: Cubietech Cubieboard
...
INTERRUPTED: Test interrupted by SIGTERM\nRunner error occurred: Timeout
reached\n
Original status: ERROR\n{'name':
'1-tests/acceptance/boot_linux_console.py:BootLinuxConsole.test_arm_cubieboard_initrd',
'logdir': '/home/me/avocado/job-results/job-2020-02-25T23.58-d43884...
(90.41 s)
...
console: random: crng init done
/console: mount: mounting devtmpfs on /dev failed: Device or resource busy
-console: EXT4-fs (sda): re-mounted. Opts:
block_validity,barrier,user_xattr,acl
/console: Starting logging: OK
INTERRUPTED: Test interrupted by SIGTERM\nRunner error occurred: Timeout
reached\nOriginal status: ERROR\n{'name':
'2-tests/acceptance/boot_linux_console.py:BootLinuxConsole.test_arm_cubieboard_sata',
'logdir': '/home/fox/avocado/job-results/job-2020-02-25T23.58-d438849/...
(90.53 s)
RESULTS    : PASS 0 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 2 |
CANCEL 0
JOB TIME   : 181.22 s
 ....

Have you noticed a similar performance change?
Do you have any clue if there may be something changed here that could
cause a slowdown?

Regards,
Niek


-- 
Niek Linnenbank

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