Re: NO_HZ_IDLE causes consistently low cpu "iowait" time (and higher cpu "idle" time)

On 03/07/2019 15:06, Doug Smythies wrote: On 2019.07.01 08:34 Alan Jenkins wrote: Hi Hi, I tried running a simple test: dd if=testfile iflag=direct bs=1M of=/dev/null With my default settings, `vmstat 10` shows something like 85% idle time to 15% iowait time. I have 4 CPUs, so this is

RE: NO_HZ_IDLE causes consistently low cpu "iowait" time (and higher cpu "idle" time)

On 2019.07.01 08:34 Alan Jenkins wrote: > Hi Hi, > I tried running a simple test: > > dd if=testfile iflag=direct bs=1M of=/dev/null > > With my default settings, `vmstat 10` shows something like 85% idle time > to 15% iowait time. I have 4 CPUs, so this is much less than one CPU > worth o