public inbox for linux-omap@vger.kernel.org
 help / color / mirror / Atom feed
From: Charles Manning <manningc2@actrix.gen.nz>
To: linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org
Subject: Huge ubi or ubifs sync slowdown since 2.6.32
Date: Tue, 21 Dec 2010 11:36:22 +1300	[thread overview]
Message-ID: <201012211136.22254.manningc2@actrix.gen.nz> (raw)


Hi All

I've been looking into a ubifs performance regression on linux-omap 2.6.37.

My test is pretty simple, copy a 2Mbyte file and sync.

# sync; date; cp 2Mbyte-file foo; sync; date

On 2.6.32 and earler, the time between the two dates was around 3 seconds.
On linux-omap master it is around 14 seconds. Ouch!

At first I thought the problem was due to changes in the OMAP nand drivers, 
but raw randwrite speed is actually a bit faster. This suggest the finger 
should be pointed at ubi or ubifs.

I then thought that perhaps the layout of my ubinized image might be a 
contributing factor so I erased the partition, ubiformatted and ubimkvoled. 
The problem persisted,

Any suggestions as to what might be broken or how to debug this deeper?

Thanks

Charles




             reply	other threads:[~2010-12-20 22:36 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-20 22:36 Charles Manning [this message]
2010-12-22 14:43 ` Huge ubi or ubifs sync slowdown since 2.6.32 Artem Bityutskiy

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=201012211136.22254.manningc2@actrix.gen.nz \
    --to=manningc2@actrix.gen.nz \
    --cc=linux-mtd@lists.infradead.org \
    --cc=linux-omap@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