Tejun Heo <tj@xxxxxxxxxx> 于2020年3月27日周五 上午12:15写道： > > On Thu, Mar 26, 2020 at 11:08:45PM +0800, Weiping Zhang wrote: > > But iocost_test1 cannot get 8/(8+1) iops, and the total disk iops > > is 737559 < 79388, even I change rrandiops=637000. > > iocost needs QoS targets set especially for deep queue devcies. W/o QoS targets, > it only throttles when QD is saturated, which might not happen at all depending > on fio job params. > > Can you try with sth like the following in io.cost.qos? > > 259:0 enable=1 ctrl=user rpct=95.00 rlat=5000 wpct=50.00 wlat=10000 > > In case you see significant bw loss, step up the r/wlat params. > OK, I'll try it. I really appreciate that if you help review blk-iotrack.c, or just drop io.iotrakc.stat and append these statistics to the io.stat? I think these metrics is usefull, and it just extend io.stat output. Thanks a ton
