linux-kernel - Re: [linus:master] [block] e70c301fae: stress-ng.aiol.ops_per

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Message-ID: <Z3ZhNYHKZPMpv8Cz@ryzen>
Date: Thu, 2 Jan 2025 10:49:41 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Oliver Sang <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
	virtualization@...ts.linux.dev, linux-nvme@...ts.infradead.org,
	Damien Le Moal <dlemoal@...nel.org>
Subject: Re: [linus:master] [block]  e70c301fae: stress-ng.aiol.ops_per_sec
 49.6% regression

Hello Oliver, Christoph,

On Tue, Dec 17, 2024 at 07:56:14AM +0100, Christoph Hellwig wrote:
> On Tue, Dec 17, 2024 at 02:55:23PM +0800, Oliver Sang wrote:
> > from below information, it seems an 'ahci' to me. but since I have limited
> > knowledge about storage driver, maybe I'm wrong. if you want more information,
> > please let us know. thanks a lot!
> 
> Yes, this looks like ahci.  Thanks a lot!

Did this ever get resolved?

I haven't seen a patch that seems to address this.

AHCI (ata_scsi_queuecmd()) only issues a single command, so if there is any
reordering when issuing a batch of commands, my guess is that the problem
also affects SCSI / the problem is in upper layers above AHCI, i.e. SCSI lib
or block layer.


Kind regards,
Niklas