Re: About scsi device queue depth

[John Garry <john.garry@xxxxxxxxxx>]

On 12/01/2021 09:06, Ming Lei wrote:
> > OPs read. Here's the fio script:
> >
> > [global]
> > rw=read
> > direct=1
> > ioengine=libaio
> > iodepth=40
> > numjobs=20
> > bs=4k
> > ;size=10240000m
> > ;zero_buffers=1
> > group_reporting=1
> > ;ioscheduler=noop
> > ;cpumask=0xffe
> > ;cpus_allowed=1-47
> > ;gtod_reduce=1
> > ;iodepth_batch=2
> > ;iodepth_batch_complete=2
> > runtime=60
> > ;thread
> > loops = 10000
> Is there any effect on random read IOPS when you decrease sdev queue
> depth? For sequential IO, IO merge can be enhanced by that way.

Let me check...

Thanks,
John