> On Sep 23, 2016, at 5:49 AM, Edgar Fuß <e...@math.uni-bonn.de> wrote:
>
>> The whole point of tagged queueing is to let you *not* set [the write
>> cache] bit in the mode pages and still get good performance.
> I don't get that. My understanding was that TCQ allowed the drive to re-order
> commands within the bounds described by the tags. With the write cache
> disabled, all write commands must hit stable storage before being reported
> completed. So what's the point of tagging with cacheing disabled?
I'm not sure. But I have the impression that in the real world tagging is
rarely, if ever, used.
paul
