From: Christoph Hellwig <hch@infradead.org>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Damien Le Moal <dlemoal@kernel.org>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@vger.kernel.org
Subject: Re: [PATCH] block: Improve read ahead size for rotational devices
Date: Mon, 16 Jun 2025 22:10:02 -0700 [thread overview]
Message-ID: <aFD4qhupi8pxDzy0@infradead.org> (raw)
In-Reply-To: <yq1zfe7xv9s.fsf@ca-mkp.ca.oracle.com>
On Mon, Jun 16, 2025 at 05:24:43PM -0400, Martin K. Petersen wrote:
> > For a SCSI disk, this defaults to 2560 KB, which significantly improve
> > performance for buffered reads.
>
> I believe this number came from a common RAID stripe configuration at
> the time. However, it's really not a great default and has caused
> problems with many devices that expect a power of two. Personally, I'd
> like this default to be something like 2MB or 4MB. MD, DM, and most
> hardware RAID devices report their stripe width correctly so the
> existing "RAID-friendly" default really shouldn't be needed.
Yeah, that number always felt weird. I'm all for using a more
round value here. But as you said, separate isue.
next prev parent reply other threads:[~2025-06-17 5:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-16 6:28 [PATCH] block: Improve read ahead size for rotational devices Damien Le Moal
2025-06-16 21:24 ` Martin K. Petersen
2025-06-16 22:45 ` Damien Le Moal
2025-06-17 5:10 ` Christoph Hellwig [this message]
2025-06-17 5:09 ` Christoph Hellwig
2025-06-17 6:58 ` John Garry
2025-07-29 7:58 ` Damien Le Moal
2025-07-29 12:27 ` Jens Axboe
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