From: kenneth johansson <ken@kenjo.org>
To: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: weird throughput on write to SATA disk
Date: Mon, 13 Oct 2008 21:19:50 +0200 [thread overview]
Message-ID: <1223925629.3947.7.camel@duo> (raw)
[-- Attachment #1: Type: text/plain, Size: 559 bytes --]
When writing data to /dev/sdb (that is the whole disk and no filesystem)
it starts out ok around 100MB/sec but soon end up doing considerably
worse. For prolonged times lasting several minutes it hovers in the
20-30MB/sec.
This happens on two different SATA disk one samsung and one seagate and
on both 2.6.26 and 2.6.27 kernel. The disk are connected to the external
esata connector. Controller is 00:1f.2 SATA controller: Intel
Corporation 82801HB (ICH8) 4 port SATA AHCI Controller (rev 02)
What could be the reason for this ?? reading is no problem.
[-- Attachment #2: log.png --]
[-- Type: image/png, Size: 5365 bytes --]
next reply other threads:[~2008-10-13 20:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-13 19:19 kenneth johansson [this message]
2008-10-13 21:07 ` weird throughput on write to SATA disk Grant Grundler
2008-10-13 21:22 ` kenneth johansson
2008-10-13 21:34 ` Grant Grundler
2008-10-13 21:35 ` Grant Grundler
2008-10-13 22:19 ` kenneth johansson
2008-10-14 1:33 ` Grant Grundler
2008-10-14 9:14 ` kenneth johansson
2008-10-14 9:17 ` Tejun Heo
2008-10-14 19:10 ` kenneth johansson
2008-10-14 16:09 ` Grant Grundler
2008-10-13 22:39 ` Alan Cox
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=1223925629.3947.7.camel@duo \
--to=ken@kenjo.org \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox