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Date: Wed, 24 Jul 2024 16:44:22 +0200
From: Christoph Hellwig <hch@lst.de>
To: kernel test robot <oliver.sang@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>, oe-lkp@lists.linux.dev,
	lkp@intel.com, linux-kernel@vger.kernel.org,
	Anna Schumaker <Anna.Schumaker@netapp.com>,
	Christoph Hellwig <hch@lst.de>,
	Shaun Tancheff <shaun.tancheff@hpe.com>,
	Sagi Grimberg <sagi@grimberg.me>, linux-fsdevel@vger.kernel.org,
	ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com
Subject: Re: [linus:master] [filemap]  9aac777aaf:
 phoronix-test-suite.iozone.1MB.512MB.WritePerformance.mb_s -14.0%
 regression
Message-ID: <20240724144422.GA13505@lst.de>
References: <202407242232.9109947e-oliver.sang@intel.com>
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In-Reply-To: <202407242232.9109947e-oliver.sang@intel.com>
User-Agent: Mutt/1.5.17 (2007-11-01)

On Wed, Jul 24, 2024 at 10:40:33PM +0800, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed a -14.0% regression of phoronix-test-suite.iozone.1MB.512MB.WritePerformance.mb_s on:
> 
> 
> commit: 9aac777aaf9459786bc8463e6cbfc7e7e1abd1f9 ("filemap: Convert generic_perform_write() to support large folios")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

This is really weird as it shouldn't make a different for file systems
not using large folios.  What file system is this test run with?