From: "Ben Israel" <ben@genesis-one.com>
To: <linux-kernel@vger.kernel.org>
Cc: "John O'Neil" <joneil@genesis-one.com>
Subject: File System Performance
Date: Mon, 12 Nov 2001 08:54:57 -0500 [thread overview]
Message-ID: <00b201c16b81$9d7aaba0$5101a8c0@pbc.adelphia.net> (raw)
My System:
Pentium III 800MHz
128M SDRAM
Aug 2001 MSC Linux
XFS File System
My Results:
hdparm /dev/hda
/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 3739/255/63, sectors = 60074784, start = 0
hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 2.71 seconds = 23.62 MB/sec
time cp -r /usr/src/linux-2.4.6 tst
real 0m47.376s
user 0m0.180s
sys 0m2.710s
du -bs tst
144187392 tst
Actual Performance
2*144MB/48s=6MB/sec
Notes:
1) for consistent results; data size should exceed file cache.
2) cp reads and writes files: so 2*3MB/sec = 6MB/sec fileio on a 24MB/sec
drive
My Questions:
Is there a way of identifying what the file system is doing here?
Is there a way to improve it?
What tools are there to identify and time the raw disk io done by the file
system?
next reply other threads:[~2001-11-12 14:54 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-12 13:54 Ben Israel [this message]
2001-11-12 16:33 ` Andrew Morton
2001-11-12 17:50 ` Ben Israel
2001-11-12 19:46 ` Andrew Morton
2001-11-12 19:59 ` Richard Gooch
2001-11-12 23:07 ` Mike Fedyk
2001-11-13 0:04 ` Richard Gooch
2001-11-13 0:08 ` Mike Fedyk
2001-11-13 0:26 ` Richard Gooch
2001-11-13 0:47 ` Mike Castle
2001-11-13 1:28 ` Mike Fedyk
2001-11-13 6:34 ` Richard Gooch
2001-11-13 20:56 ` Andreas Dilger
2001-11-13 7:45 ` Andreas Dilger
2001-11-12 20:06 ` Steve Lord
2001-11-12 20:41 ` Andrew Morton
2001-11-13 0:17 ` Andreas Dilger
2001-11-13 0:40 ` Peter J . Braam
2001-11-13 20:46 ` Andreas Dilger
2001-11-16 22:07 ` Peter J . Braam
2001-11-16 23:14 ` Mike Fedyk
2001-11-12 21:27 ` Steve Lord
2001-11-12 21:43 ` Andrew Morton
2001-11-12 21:48 ` Linus Torvalds
2001-11-12 22:11 ` Lionel Bouton
2001-11-12 19:41 ` Gérard Roudier
2001-11-12 22:14 ` Linus Torvalds
2001-11-12 22:30 ` Ragnar Kjørstad
2001-11-12 22:36 ` Andrew Morton
2001-11-12 23:04 ` Mike Castle
2001-11-13 9:56 ` Peter Wächtler
2001-11-13 9:41 ` Henning P. Schmiedehausen
2001-11-12 22:16 ` Andrew Morton
2001-11-12 22:32 ` Lionel Bouton
2001-11-12 22:45 ` Alan Cox
2001-11-12 22:39 ` Alan Cox
2001-11-12 22:39 ` Xavier Bestel
2001-11-12 22:46 ` Mike Castle
2001-11-12 22:26 ` Steve Lord
2001-11-12 21:45 ` Steve Lord
2001-11-12 21:53 ` Lionel Bouton
2001-11-12 16:40 ` Ben Israel
2001-11-12 17:29 ` Andrew Morton
2001-11-12 22:36 Grant Erickson
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='00b201c16b81$9d7aaba0$5101a8c0@pbc.adelphia.net' \
--to=ben@genesis-one.com \
--cc=joneil@genesis-one.com \
--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
all inboxes | Powered by JetHome®