From: Dave Chinner <david@fromorbit.com>
To: Eric Sandeen <sandeen@sandeen.net>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>,
Gandalf Corvotempesta <gandalf.corvotempesta@gmail.com>,
linux-xfs@vger.kernel.org
Subject: Re: agcount for 2TB, 4TB and 8TB drives
Date: Sat, 7 Oct 2017 09:20:31 +1100 [thread overview]
Message-ID: <20171006222031.GU3666@dastard> (raw)
In-Reply-To: <8e6fd742-8767-e786-746d-2b9f2929b98c@sandeen.net>
On Fri, Oct 06, 2017 at 11:18:39AM -0500, Eric Sandeen wrote:
> On 10/6/17 10:38 AM, Darrick J. Wong wrote:
> > On Fri, Oct 06, 2017 at 10:46:20AM +0200, Gandalf Corvotempesta wrote:
> > Semirelated question: for a solid state disk on a machine with high CPU
> > counts do we prefer agcount == cpucount to take advantage of the
> > high(er) iops and lack of seek time to increase parallelism?
> >
> > (Not that I've studied that in depth.)
>
> Interesting question. :) Maybe harder to answer for SSD black boxes?
Easy: switch to multidisk mode if /sys/block/<dev>/queue/rotational
is zero after doing all the other checks. Then SSDs will get larger
AG counts automatically.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2017-10-06 22:20 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-06 8:46 agcount for 2TB, 4TB and 8TB drives Gandalf Corvotempesta
2017-10-06 15:38 ` Darrick J. Wong
2017-10-06 16:18 ` Eric Sandeen
2017-10-06 22:20 ` Dave Chinner [this message]
2017-10-06 22:21 ` Eric Sandeen
2017-10-09 8:05 ` Avi Kivity
2017-10-09 11:23 ` Dave Chinner
2017-10-09 15:46 ` Avi Kivity
2017-10-09 22:03 ` Dave Chinner
2017-10-10 9:07 ` Avi Kivity
2017-10-10 22:55 ` Dave Chinner
2017-10-13 8:13 ` Avi Kivity
2017-10-14 22:42 ` Dave Chinner
2017-10-15 9:36 ` Avi Kivity
2017-10-15 22:00 ` Dave Chinner
2017-10-16 10:00 ` Avi Kivity
2017-10-16 22:31 ` Dave Chinner
2017-10-18 7:31 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171006222031.GU3666@dastard \
--to=david@fromorbit.com \
--cc=darrick.wong@oracle.com \
--cc=gandalf.corvotempesta@gmail.com \
--cc=linux-xfs@vger.kernel.org \
--cc=sandeen@sandeen.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.