From: Phil Turmel <philip@turmel.org>
To: Robert Kierski <rkierski@cray.com>,
Dallas Clement <dallas.a.clement@gmail.com>
Cc: "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: RAID 5,6 sequential writing seems slower in newer kernels
Date: Wed, 2 Dec 2015 10:51:11 -0500 [thread overview]
Message-ID: <565F136F.2090709@turmel.org> (raw)
In-Reply-To: <F7761B9B1D11B64BBB666019E9378117FDDC2A@CFWEX01.americas.cray.com>
On 12/02/2015 10:44 AM, Robert Kierski wrote:
> I've tried a variety of settings... ranging from 17 to 32768.
>
> Yes.. with stripe_cache_size set to 17, I see a C/T of rmw's. And my TP goes in the toilet -- even with the RAM disks, I get only about 30M/s.
Ok.
You mentioned you aren't using a filesystem. How are you testing?
Phil
ps. convention on kernel.org is to trim replies and bottom-post, or
interleave. Please do.
next prev parent reply other threads:[~2015-12-02 15:51 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 23:02 RAID 5,6 sequential writing seems slower in newer kernels Dallas Clement
2015-12-02 1:07 ` keld
2015-12-02 14:18 ` Robert Kierski
2015-12-02 14:45 ` Phil Turmel
2015-12-02 15:28 ` Robert Kierski
2015-12-02 15:37 ` Phil Turmel
2015-12-02 15:44 ` Robert Kierski
2015-12-02 15:51 ` Phil Turmel [this message]
2015-12-02 19:50 ` Dallas Clement
2015-12-03 0:12 ` Dallas Clement
2015-12-03 2:18 ` Phil Turmel
2015-12-03 2:24 ` Dallas Clement
2015-12-03 2:33 ` Dallas Clement
2015-12-03 2:38 ` Phil Turmel
2015-12-03 2:51 ` Dallas Clement
2015-12-03 4:30 ` Phil Turmel
2015-12-03 4:49 ` Dallas Clement
2015-12-03 13:43 ` Robert Kierski
2015-12-03 14:37 ` Phil Turmel
2015-12-03 2:34 ` Phil Turmel
2015-12-03 14:19 ` Robert Kierski
2015-12-03 14:39 ` Dallas Clement
2015-12-03 15:04 ` Phil Turmel
2015-12-03 22:21 ` Weedy
2015-12-04 13:40 ` Robert Kierski
2015-12-04 16:08 ` Dallas Clement
2015-12-07 14:29 ` Robert Kierski
2015-12-08 19:38 ` Dallas Clement
2015-12-08 21:24 ` Robert Kierski
2015-12-04 18:51 ` Shaohua Li
2015-12-05 1:38 ` Dallas Clement
2015-12-07 14:18 ` Robert Kierski
2015-12-02 15:37 ` Robert Kierski
2015-12-02 5:22 ` Roman Mamedov
2015-12-02 14:15 ` Robert Kierski
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=565F136F.2090709@turmel.org \
--to=philip@turmel.org \
--cc=dallas.a.clement@gmail.com \
--cc=linux-raid@vger.kernel.org \
--cc=rkierski@cray.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).