linux-kernel - Re: [RFC PATCH 0/1] Large folios in block buffered IO path

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Message-ID: <Z0fwCFCKD6lZVGg7@casper.infradead.org>
Date: Thu, 28 Nov 2024 04:22:32 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Bharata B Rao <bharata@....com>
Cc: Mateusz Guzik <mjguzik@...il.com>, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, nikunj@....com, vbabka@...e.cz,
	david@...hat.com, akpm@...ux-foundation.org, yuzhao@...gle.com,
	axboe@...nel.dk, viro@...iv.linux.org.uk, brauner@...nel.org,
	jack@...e.cz, joshdon@...gle.com, clm@...a.com
Subject: Re: [RFC PATCH 0/1] Large folios in block buffered IO path

On Thu, Nov 28, 2024 at 09:31:50AM +0530, Bharata B Rao wrote:
> However a point of concern is that FIO bandwidth comes down drastically
> after the change.
> 
> 		default				inode_lock-fix
> rw=30%
> Instance 1	r=55.7GiB/s,w=23.9GiB/s		r=9616MiB/s,w=4121MiB/s
> Instance 2	r=38.5GiB/s,w=16.5GiB/s		r=8482MiB/s,w=3635MiB/s
> Instance 3	r=37.5GiB/s,w=16.1GiB/s		r=8609MiB/s,w=3690MiB/s
> Instance 4	r=37.4GiB/s,w=16.0GiB/s		r=8486MiB/s,w=3637MiB/s

Something this dramatic usually only happens when you enable a debugging
option.  Can you recheck that you're running both A and B with the same
debugging options both compiled in, and enabled?