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Sudden slowdown of ARM emulation in master


From: Niek Linnenbank
Subject: Sudden slowdown of ARM emulation in master
Date: Wed, 26 Feb 2020 00:07:55 +0100

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/address@hidden' 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 (address@hidden) (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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