linux-kernel - Re: [RFC PATCH 00/20] Introduce the famfs shared-memory file system

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Message-ID: <CAB=NE6UvHSvTJJCq-YuBEZNo8F5Kg25aK+2im=V7DgEsTJ8wPg@mail.gmail.com>
Date: Mon, 26 Feb 2024 16:58:09 -0800
From: Luis Chamberlain <mcgrof@...nel.org>
To: John Groves <John@...ves.net>
Cc: John Groves <jgroves@...ron.com>, Jonathan Corbet <corbet@....net>, 
	Dan Williams <dan.j.williams@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, 
	Dave Jiang <dave.jiang@...el.com>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>, 
	linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	nvdimm@...ts.linux.dev, john@...alactic.com, 
	Dave Chinner <david@...morbit.com>, Christoph Hellwig <hch@...radead.org>, dave.hansen@...ux.intel.com, 
	gregory.price@...verge.com
Subject: Re: [RFC PATCH 00/20] Introduce the famfs shared-memory file system

On Mon, Feb 26, 2024 at 1:16 PM John Groves <John@...ves.net> wrote:
>
> On 24/02/26 07:53AM, Luis Chamberlain wrote:
> > On Mon, Feb 26, 2024 at 07:27:18AM -0600, John Groves wrote:
> > > Run status group 0 (all jobs):
> > >   WRITE: bw=29.6GiB/s (31.8GB/s), 29.6GiB/s-29.6GiB/s (31.8GB/s-31.8GB/s), io=44.7GiB (48.0GB), run=1511-1511msec
> >
> > > This is run on an xfs file system on a SATA ssd.
> >
> > To compare more closer apples to apples, wouldn't it make more sense
> > to try this with XFS on pmem (with fio -direct=1)?
> >
> >   Luis
>
> Makes sense. Here is the same command line I used with xfs before, but
> now it's on /dev/pmem0 (the same 128G, but converted from devdax to pmem
> because xfs requires that.
>
> fio -name=ten-256m-per-thread --nrfiles=10 -bs=2M --group_reporting=1 --alloc-size=1048576 --filesize=256MiB --readwrite=write --fallocate=none --numjobs=48 --create_on_open=0 --ioengine=io_uring --direct=1 --directory=/mnt/xfs

Could you try with mkfs.xfs -d agcount=1024

 Luis