Re: [PATCH 0/2] Increase amount of data for monitor to read

[Andrey Shinkevich]

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