Re: [bug report] block: Non-NCQ commands will never be executed while fio is continuously running

[Damien Le Moal]

On 9/9/24 22:10, yangxingui wrote:
> Hello axboe & John,
> 
> After the driver exposes all HW queues to the block layer, non-NCQ 
> commands will never be executed while fio is continuously running, such 
> as a smartctl command.
> 
> The cause of the problem is that other hctx used by the NCQ command is 
> still active and can continue to issue NCQ commands to the sata disk.
> And the pio command keeps retrying in its corresponding hctx because 
> qc_defer() always returns true.
> 
> hctx0: ncq, pio, ncq
> hctx1：ncq, ncq, ...
> ...
> hctxn: ncq, ncq, ...
> 
> Is there any good solution for this?

SATA devices are single queue so how can you have multiple queues ?
What adapter are you using ?

-- 
Damien Le Moal
Western Digital Research