On Tue, Nov 30, 2021 at 06:28:10PM +0800, huang...@chinatelecom.cn wrote:
> From: Hyman Huang(黄勇) <huang...@chinatelecom.cn>
>
> The patch [2/3] has not been touched so far. Any corrections and
> suggetions are welcome.
I played with it today, but the vcpu didn't got throttled as expected.
What I did was starting two workload with 500mb/s, each pinned on one vcpu
thread:
[root@fedora ~]# pgrep -fa mig_mon
595 ./mig_mon mm_dirty 1000 500 sequential
604 ./mig_mon mm_dirty 1000 500 sequential
[root@fedora ~]# taskset -pc 595
pid 595's current affinity list: 2
[root@fedora ~]# taskset -pc 604
pid 604's current affinity list: 3
Then start throttle with 100mb/s:
(QEMU) set-dirty-limit cpu-index=3 dirty-rate=100
{"return": {}}
(QEMU) set-dirty-limit cpu-index=2 dirty-rate=100
{"return": {}}
I can see the workload dropped a tiny little bit (perhaps 500mb -> 499mb), then
it keeps going..
Further throttle won't work too:
(QEMU) set-dirty-limit cpu-index=2 dirty-rate=10
{"return": {}}
Funnily, the ssh client got slowed down instead... :(
Yong, how did you test it?
--
Peter Xu
