Re: [blktests] zbd/012: Test requeuing of zoned writes and queue freezing

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On 11/27/24 3:33 PM, Christoph Hellwig wrote:
> On Wed, Nov 27, 2024 at 03:32:04PM +0900, Damien Le Moal wrote:
>> Might be good enough. But will also need to clear the REQ_NOWAIT flag for the
>> BIO if it is issued from the zone write plug BIO work. Because that one should
>> not have to deal with all this.
> 
> Yes, by that time there is no point in the nowait.
> 
> Another simpler option would be to always use the zone write plug BIO
> work to issue NOWAIT bios.

I thought about that one. The problem with it is the significant performance
penalty that the context switch to the zone write plug BIO work causes. But
that is for qd=1 writes only... If that is acceptable, that solution is
actually the easiest. The overhead is not an issue for HDDs and for ZNS SSDs,
zone append to the rescue ! So maybe for now, it is best to just do that.


-- 
Damien Le Moal
Western Digital Research




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