From: Mike Looijmans <mike.looijmans@topic.nl>
To: "openembedded-core@lists.openembedded.org"
<openembedded-core@lists.openembedded.org>
Subject: wic creates ext4 images that read really slow in u-boot
Date: Tue, 19 Feb 2019 11:20:34 +0000 [thread overview]
Message-ID: <83ec17fa-88b0-04fa-adab-b402b10c6339@topic.nl> (raw)
Took me a while to figure out why my board took 90 seconds to boot suddenly.
The issue turned out to be the ext4 partition created by wic.
On a "wic" created ext4 disk, this is what u-boot does:
ZynqMP> load mmc 0:2 0x100000 /lib/firmware/fpga.bin
19311092 bytes read in 85529 ms (219.7 KiB/s)
Now if I boot the board rename and copy that file onto itself, then it's
suddenly normal again when I reboot the board:
ZynqMP> load mmc 0:2 0x100000 /lib/firmware/fpga.bin
19311092 bytes read in 1426 ms (12.9 MiB/s)
I checked with other files, and it turns out that ANY big file written by wic
will read very slow (at 200k/s) but if I make a copy from a running system, it
suddenly reads fast.
I'm not knowledgeable on ext4, so any ideas what's being passed onto the image
creation tool that causes this?
next reply other threads:[~2019-02-19 16:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-19 11:20 Mike Looijmans [this message]
2019-02-19 17:13 ` wic creates ext4 images that read really slow in u-boot Leon Woestenberg
2019-02-19 19:28 ` Andre McCurdy
2019-02-19 20:45 ` Leon Woestenberg
2019-02-20 9:12 ` Jack Mitchell
2019-02-20 10:42 ` Mike Looijmans
2019-02-20 15:44 ` Leon Woestenberg
2019-02-21 10:43 ` Burton, Ross
2019-02-20 10:55 ` Mike Looijmans
2019-02-21 14:33 ` Tom Rini
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=83ec17fa-88b0-04fa-adab-b402b10c6339@topic.nl \
--to=mike.looijmans@topic.nl \
--cc=openembedded-core@lists.openembedded.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