From: "bo" <bo@sosnetwork.net>
To: linux-raid@vger.kernel.org
Subject: RE:What are those changes for fixing the RAID0 performance?
Date: Mon, 19 Aug 2002 08:01:53 -0700 [thread overview]
Message-ID: <010401c24791$5aeb3830$5701a8c0@bomoon> (raw)
Neil And RAIDers,
I have been looking for "what changes are made to fix/improve the parallel
access(?) to disks simultanously?".
I noticed as follow;
Up to Linux2.4.9 it got the same performance for RAID0(2-way stripe) and a
single disk(JBOD),
about 15 MB/sec with DMA on(hdparm -tT /dev/mdx).
On Linux 2.4.10 it improves to about 25 MB/sec for RAID0, 15 MB/sec for
single disk.
On Linux 2.4.18 it got the right performance; about 31 MB/sec for RAID0.
I tried to port the difference on /driver/ide and /drivers/md, but it did
not help.
I think there were changes on other functions to fix the parallel access(?)
to disks simultanously OR
to improve the RAID0 performance .
Why am I doing this kind of homework?
I can not migrate our linux to 2.4.18 so I want to port ONLY the fixes for
this performance
issue. I use Linux2.4.5.
Please help me if you know how I can work around.
Thanks in advance,
Bo
next reply other threads:[~2002-08-19 15:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-19 15:01 bo [this message]
2002-08-19 15:21 ` What are those changes for fixing the RAID0 performance? Eff Norwood
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='010401c24791$5aeb3830$5701a8c0@bomoon' \
--to=bo@sosnetwork.net \
--cc=linux-raid@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