Re: About scsi device queue depth

John Garry
2021-01-12T09:25:34Z

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