On 09.11.2020 13:04, Vladimir Sementsov-Ogievskiy wrote:
09.11.2020 11:50, Vladimir Sementsov-Ogievskiy wrote:
06.11.2020 15:42, Andrey Shinkevich wrote:
The subject was discussed here:
https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg00206.html
This series is a solution for the issue with QMP monitor buffered input.
A little parser is introduced to throttle JSON commands read from the
buffer so that QMP requests do not overwhelm the monitor input queue.
A side effect raised in the test #247 was managed in the first patch.
It may be considered as a workaround. Any sane fix suggested will be
appreciated.
Note:
This series goes after the Vladimir's one:
'[PATCH v3 00/25] backup performance: block_status + async"'
To make the test #129 passed, the following patch should be applied
first:
'[PATCH v3 01/25] iotests: 129 don't check backup "busy"'.
[...]
Positive thing: the patches do increase performance:
for me, the following command:
(echo "{ 'execute': 'qmp_capabilities' }"; for i in {1..10000}; do echo
"{ 'execute': 'query-block-jobs' }"; done; echo "{ 'execute': 'quit' }"
) | time ./qemu-system-x86_64 -qmp stdio > /dev/null
shows 2.4s on master and 0.6s after patches
Thank you for testing it. I'd like to include the result to the patch
description with "Tested-by: ..."
Andrey
