linux-kernel - Re: [linus:master] [nvme] 63dfa10043: fsmark.files_per

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Date: Tue, 19 Mar 2024 10:49:16 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Christoph Hellwig <hch@....de>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	Keith Busch <kbusch@...nel.org>, Max Gurtovoy <mgurtovoy@...dia.com>,
	<linux-nvme@...ts.infradead.org>, <ying.huang@...el.com>,
	<feng.tang@...el.com>, <fengwei.yin@...el.com>, <oliver.sang@...el.com>
Subject: Re: [linus:master] [nvme]  63dfa10043:  fsmark.files_per_sec 6.4%
 improvement

hi, Christoph Hellwig,

On Sun, Mar 17, 2024 at 09:36:45PM +0100, Christoph Hellwig wrote:
> On Fri, Mar 15, 2024 at 04:21:13PM +0800, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > kernel test robot noticed a 6.4% improvement of fsmark.files_per_sec on:
> > 
> > 
> > commit: 63dfa1004322d596417f23da43cdc43cf6298c71 ("nvme: move NVME_QUIRK_DEALLOCATE_ZEROES out of nvme_config_discard")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> > 
> > testcase: fsmark
> > test machine: 96 threads 2 sockets Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz (Cascade Lake) with 128G memory
> > parameters:
> 
> That is kinda odd and unexpected.  Is this system using one of the old
> Intel SSDs that this quirk is actually used for?
>

yeah, the nvme sdd on this system is quite old (DC P3608 serial):

https://www.intel.com/content/dam/www/public/us/en/documents/product-specifications/ssd-dc-p3608-spec.pdf