From: Jens Axboe <jens.axboe@oracle.com>
To: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
Cc: Dmitri Monakhov <dmonakhov@openvz.org>, linux-fsdevel@vger.kernel.org
Subject: Re: write is faster whan seek?
Date: Wed, 11 Jun 2008 13:49:54 +0200 [thread overview]
Message-ID: <20080611114950.GW20851@kernel.dk> (raw)
In-Reply-To: <484FB92D.4090808@hp.com>
On Wed, Jun 11 2008, Alan D. Brunelle wrote:
> Dmitri Monakhov wrote:
>
> Could it be that in the first case you will have merges, thus creating
> fewer/larger I/O requests? Running iostat -x during the two runs, and
> watching the output is a good first place to start.
I think it's mostly down to whether a specific drive is good at doing
124kb writes + 4k seek (and repeat) compared to regular streaming
writes. The tested disk was SATA with write back caching, there should
be no real command overhead gain in those size ranges.
--
Jens Axboe
next prev parent reply other threads:[~2008-06-11 11:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-11 7:20 write is faster whan seek? Dmitri Monakhov
2008-06-11 7:48 ` Jens Axboe
2008-06-11 8:11 ` Dmitri Monakhov
2008-06-11 8:26 ` Jens Axboe
2008-06-11 9:28 ` Dmitri Monakhov
2008-06-11 9:38 ` Jens Axboe
2008-06-11 11:38 ` Alan D. Brunelle
2008-06-11 11:49 ` Jens Axboe [this message]
2008-06-11 11:52 ` Alan D. Brunelle
2008-06-11 11:55 ` Jens Axboe
2008-06-16 12:14 ` Dmitri Monakhov
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=20080611114950.GW20851@kernel.dk \
--to=jens.axboe@oracle.com \
--cc=Alan.Brunelle@hp.com \
--cc=dmonakhov@openvz.org \
--cc=linux-fsdevel@vger.kernel.org \
/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.