On Mon, Dec 19, 2016 at 04:51:22PM +0800, Dou Liyang wrote: > These patches aim to refactor the qmp_query_blockstats() and > improve the performance by reducing the running time of it. > > qmp_query_blockstats() is used to monitor the blockstats, it > querys all the graph_bdrv_states or monitor_block_backends. > > There are the two jobs: > > 1 For the performance: > > 1.1 the time it takes(ns) in each time: > the disk numbers | 10 | 500 > ------------------------------------- > before these patches | 19429 | 667722 > after these patches | 17516 | 557044 > > 1.2 the I/O performance is degraded(%) during the monitor: > > the disk numbers | 10 | 500 > ------------------------------------- > before these patches | 1.3 | 14.2 > after these patches | 0.8 | 9.1
Do you know what is consuming the remaining 9.1%? I'm surprised to see such a high performance impact caused by a QMP command. Please post your QEMU command-line.
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