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Date: Mon, 24 Jun 2024 17:20:28 +0200
From: Christoph Hellwig <hch@lst.de>
To: Niklas Cassel <cassel@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>,
	kernel test robot <oliver.sang@intel.com>, oe-lkp@lists.linux.dev,
	lkp@intel.com, Jens Axboe <axboe@kernel.dk>,
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Subject: Re: [axboe-block:for-next] [block]  bd4a633b6f:
 fsmark.files_per_sec -64.5% regression
Message-ID: <20240624152028.GA11961@lst.de>
References: <202406241546.6bbd44a7-oliver.sang@intel.com> <20240624083537.GA19941@lst.de> <Znl4lXRmK2ukDB7r@ryzen.lan>
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On Mon, Jun 24, 2024 at 03:45:57PM +0200, Niklas Cassel wrote:
> Seems to be ATA SSD:
> https://download.01.org/0day-ci/archive/20240624/202406241546.6bbd44a7-oliver.sang@intel.com/job.yaml
> 
> ssd_partitions: "/dev/disk/by-id/ata-INTEL_SSDSC2BG012T4_BTHC428201ZX1P2OGN-part1"
> 
> Most likely btrfs does something different depending on the nonrot flag
> being set or not. (And like you are suggesting, most likely the value of
> the nonrot flag is somehow different after commit bd4a633b6f)

Yes, btrfs does.  That's why I'm curious about the before and after,
as I can't see any way how they would be set differently.  Right now
I can only claim with vitual AHCI devices, which claim to be rotational,
though.