linux-kernel - Re: [axboe-block:for-next] [block] bd4a633b6f: fsmark.files_per

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Date: Mon, 24 Jun 2024 17:20:28 +0200
From: Christoph Hellwig <hch@....de>
To: Niklas Cassel <cassel@...nel.org>
Cc: Christoph Hellwig <hch@....de>,
	kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, Jens Axboe <axboe@...nel.dk>,
	Damien Le Moal <dlemoal@...nel.org>, Hannes Reinecke <hare@...e.de>,
	linux-m68k@...ts.linux-m68k.org, linux-um@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	drbd-dev@...ts.linbit.com, nbd@...er.debian.org,
	linuxppc-dev@...ts.ozlabs.org, ceph-devel@...r.kernel.org,
	virtualization@...ts.linux.dev, xen-devel@...ts.xenproject.org,
	linux-bcache@...r.kernel.org, dm-devel@...ts.linux.dev,
	linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-mtd@...ts.infradead.org, nvdimm@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-s390@...r.kernel.org,
	linux-scsi@...r.kernel.org, ying.huang@...el.com,
	feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [axboe-block:for-next] [block]  bd4a633b6f:
 fsmark.files_per_sec -64.5% regression

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.