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Thread: High I/O Wait After Login

  1. #1
    Join Date
    Dec 2009
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    Singapore
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    73
    Distro
    Ubuntu

    High I/O Wait After Login

    Shortly after logging into Ubuntu (10.04), the System Monitor started to show high I/O wait activity, levelling at about 50% of the graph (presumably because I use a dual-core laptop). At the same time, the hard disk read/write indicator light is lit. The program iotop revealed the Ubuntu One Sync Daemon to be the one responsible. Presumably the Ubuntu One is trying to hash the files (since it occurs even if I'm disconnected).

    Now, the problem with this is that this intense hard disk hogging can take up to two or three minutes, which makes Ubuntu insufferably slow. Opening Firefox is okay, but the browser is constantly greyed out and lags horribly. It reminds me of those Windows days when I try to use my computer while a virus scanner is grinding my hard disk.

    Given that I often shut down my laptop when I don't use it (about 3 to 4 times a day), this makes Ubuntu lose much of its lustre. So my question: is this normal behaviour, i.e. are other people experiencing such a situation as well?

  2. #2
    Join Date
    Mar 2006
    Location
    Canada, Chile
    Beans
    104
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: High I/O Wait After Login

    Jackson, I experience a similar slow startup. Mine lasts for about a minute or so. Kinda reminds me (not so fondly) of those old Windoze days, though I hasten to add that having Ubuntu One watching over my files is WAY preferable to having a bunch of Windoze crapware running in the background.
    C'est ma façon de parler.

  3. #3
    Join Date
    Dec 2009
    Location
    Singapore
    Beans
    73
    Distro
    Ubuntu

    Re: High I/O Wait After Login

    True, knowing that it is a program that you use and not a bunch of unknown processes is more reassuring, but nonetheless it is rather dampening to have a Linux system behave like Windows. Furthermore, as some have expressed in other threads, Dropbox does not suffer this issue.

    I'm all for Canonical to find ways to sustain their business. That's why I'm willing to use Ubuntu One (paid account) over Dropbox. Nonetheless, I think the product should not have such burdens.

  4. #4
    Join Date
    Dec 2009
    Location
    Singapore
    Beans
    73
    Distro
    Ubuntu

    Re: High I/O Wait After Login

    Hi all,

    I've posted this problem in Ask Ubuntu as well, and some Ubuntu One staff responded. This is his response:

    It is a known issue in ubuntuone-syncdaemon versions prior to what's currently in Natty. We're working on getting backports of the fix to this (and many more) issues backported to 10.04; unfortunately we didn't make it in time for 10.04.2, but we'll try to get things into a PPA soon (within a month or so). I'll update this answer when we do that.
    So quite possibly we'll see a remedy of the issue in the coming months.

  5. #5
    Join Date
    Jun 2008
    Beans
    26

    Re: High I/O Wait After Login

    Don't get fooled by thinking iowait is an indication of a slow anything. It's perfectly normal on a system doing a lot of I/O. All it means is the only thing the cpu was doing during a timeslice was i/o. If things are slow, it has to be something else! Run something like collectl and look at what it says is going on.
    -mark

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