From: Sitsofe Wheeler <sitsofe@gmail.com>
To: Slow bucks <frankwhitebe@gmail.com>
Cc: "fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: randrepeat false for ssds
Date: Mon, 6 Feb 2017 20:14:18 +0000 [thread overview]
Message-ID: <CALjAwxhRGvFh=t60=OJ6s0dpuJ=z1waPQF=OpKVZZtwsjZtaOA@mail.gmail.com> (raw)
In-Reply-To: <o7a678$p7c$1@blaine.gmane.org>
Depends on your objective (are you trying to dodge tricks your SSD
might do?) but bear in you can't control where the SSD ultimately
chooses to put the data or how much it chooses to stuff into each
erase block size. Additionally randrepeat only has an impact when an
entire run is repeated. Some modern SSDs do compression/de-duplication
so if you want to try defeat that you might want to look at the
refill_buffers/scramble_buffers parameters
(http://fio.readthedocs.io/en/latest/fio_doc.html#cmdoption-arg-refill_buffers
).
On 6 February 2017 at 15:54, Slow bucks <frankwhitebe@gmail.com> wrote:
> Does it make sense to disable randrepeat on SSDs with the way data is
> written (always write to new block with empty pages)?
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe fio" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Sitsofe | http://sucs.org/~sits/
next prev parent reply other threads:[~2017-02-06 20:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-06 15:54 randrepeat false for ssds Slow bucks
2017-02-06 20:14 ` Sitsofe Wheeler [this message]
2017-02-06 21:57 ` Slow bucks
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='CALjAwxhRGvFh=t60=OJ6s0dpuJ=z1waPQF=OpKVZZtwsjZtaOA@mail.gmail.com' \
--to=sitsofe@gmail.com \
--cc=fio@vger.kernel.org \
--cc=frankwhitebe@gmail.com \
/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.