From: Chris Mason <chris.mason@oracle.com>
To: Dominik Brodowski <linux@dominikbrodowski.net>,
josef@redhat.com, Valdis.Kletnieks@vt.edu,
Michael Monnerie <michael.monnerie@is.it-management.at>,
Christoph Hellwig <hch@infradead.or>
Subject: Re: direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs]
Date: Thu, 5 Aug 2010 11:39:43 -0400 [thread overview]
Message-ID: <20100805153943.GO29846@think> (raw)
In-Reply-To: <20100805153519.GA7242@comet.dominikbrodowski.net>
On Thu, Aug 05, 2010 at 05:35:19PM +0200, Dominik Brodowski wrote:
> Hey,
>
> On Thu, Aug 05, 2010 at 07:32:40AM -0400, Chris Mason wrote:
> > But, I'm surprised your drive is doing 8K dio reads at 16MB/s, that
> > seems a little high.
>
> Well, that's what it does:
>
> # $ dd if=/dev/mapper/vg0-home_crypt of=/dev/zero iflag=direct bs=8k count=131072 seek=131072
> # 131072+0 records in
> # 131072+0 records out
> # 1073741824 bytes (1.1 GB) copied, 62.0177 s, 17.3 MB/s
Can I ask you to do the test directly to the real honest to goodness
drive? If it were an SSD I'd be less surprised, but then the extra
submits shouldn't hurt the ssd that much either.
Thanks for testing the patch, I'll send it in.
-chris
next prev parent reply other threads:[~2010-08-05 15:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 7:35 How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs Dominik Brodowski
2010-08-04 8:50 ` Christoph Hellwig
2010-08-04 9:13 ` Dominik Brodowski
2010-08-04 9:21 ` Christoph Hellwig
2010-08-04 9:16 ` Michael Monnerie
2010-08-04 10:25 ` Dominik Brodowski
2010-08-04 11:18 ` Christoph Hellwig
2010-08-04 11:24 ` Dominik Brodowski
2010-08-04 11:53 ` Mikael Abrahamsson
2010-08-04 12:56 ` Mike Snitzer
2010-08-04 22:24 ` Neil Brown
[not found] ` <20100804111803.GA32643__39273.3621680692$1280923964$gmane$org@infradead.org>
2010-08-04 17:43 ` Andi Kleen
2010-08-04 20:33 ` Valdis.Kletnieks
2010-08-05 9:31 ` direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs] Dominik Brodowski
2010-08-05 11:32 ` Chris Mason
2010-08-05 12:36 ` Josef Bacik
2010-08-05 15:35 ` Dominik Brodowski
2010-08-05 15:39 ` Chris Mason [this message]
2010-08-05 15:53 ` Dominik Brodowski
2010-08-05 16:35 ` Dominik Brodowski
2010-08-05 20:47 ` Performance impact of CONFIG_DEBUG? direct-io test case Dominik Brodowski
2010-08-05 20:54 ` Performance impact of CONFIG_SCHED_MC? " Dominik Brodowski
2010-08-05 18:58 ` direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs] Jeff Moyer
2010-08-05 19:01 ` Chris Mason
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=20100805153943.GO29846@think \
--to=chris.mason@oracle.com \
--cc=Valdis.Kletnieks@vt.edu \
--cc=hch@infradead.or \
--cc=josef@redhat.com \
--cc=linux@dominikbrodowski.net \
--cc=michael.monnerie@is.it-management.at \
/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).