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Re: zRAM broken on Raring?

 

There are freezes with ZRAM in Precise, too. I experience this both with original stack/kernel and the enablement stack from Raring. Sometimes while shutting down, sometimes after a long session or when the RAM is "full". After disabling ZRAM, there are no problems at all.

Jörn


Am 28.09.2013 01:32, schrieb Phill Whiteside:
Hi John,

the change in Saucy was that the config was altered so that it was used during the desktop install (Ubiquity), before that it was there just not used for the task of allowing ubiquity to run and install onto a system that we had the crazy situation of the installer needing more RAM than the actual installed system needs.

The testing team did many tests to find out just how low we could go with 'desktop installer'. They found ~ 384MB to be the minimum for it. As a server person, I use the alternate installs, but the desktop one is more new comer friendly :)

Regards,

Phill.


On 28 September 2013 00:06, John Hupp <lubuntu@xxxxxxxxxxxxxx <mailto:lubuntu@xxxxxxxxxxxxxx>> wrote:

    The news/announcements concerning Saucy tend to say something "new
    in Saucy ... zRAM."

    But zram-config is installed in my Raring i386 standard desktop
    installation, and I didn't install it unless it came along as a
    dependency for something.


    On 9/27/2013 6:29 PM, Nio Wiklund wrote:

        Sorry, I overlooked that John is running Raring. I didn't
        think zRAM was
        used in Raring, but of course, John can install and run it.
        I'm glad you
        corrected that mistake by me.

        Best regards
        Nio

        On 2013-09-28 00:08, Phill Whiteside wrote:

            hi Nio,

            he is running Raring. The bug we see in Saucy on 1227202
            is totally
            un-related to the sudo parted -l issue.

            Getting the race issue sorted out on un-mounting the zram
            areas is what
            the bug fix is. With all the tests I've done, the

              Error: /dev/zram0: unrecognised disk label

            Error: /dev/zram1: unrecognised disk label

            Has remained until I used the 3.12rc kernel. We will go
            battle that
            issue on Monday to see if we can find the fix. Also do
            read
            https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1215379
            as we
            may be barking up the wrong tree with zram, and should be
            using zswap.

            Joe cannot tell us which is better to use, just that zswap
            was in the
            3.11.2 upstream kernel which has been imported into the latest
            3.11.0-9.16 kernel.

            It was Unit193 who pointed that issue out, and whilst
            getting the race
            crash sorted out, it appears that zswap is the updated system.

            Regards,

            Phill.


            On 27 September 2013 22:54, Nio Wiklund
            <nio.wiklund@xxxxxxxxx <mailto:nio.wiklund@xxxxxxxxx>
            <mailto:nio.wiklund@xxxxxxxxx
            <mailto:nio.wiklund@xxxxxxxxx>>> wrote:

                 On 2013-09-27 23:28, John Hupp wrote:
                 > On Raring, output from 'sudo parted -l' includes:
                 >
                 >     Error: /dev/zram0: unrecognised disk label
                 >
                 > And syslog shows a slew of errors:
                 >
                 >     Lubuntu kernel: Buffer I/O error on device
            zram0, logical
                 block 128247
                 >
                 > Syslog also indicates that half of memory was given
            to zram to
                 form its
                 > block device.
                 >
                 > Does this mean that half of memory is dedicated to
            something that
                 isn't
                 > working?  And perhaps that machines will hang when
            swap is needed?
                 >
                 > I arrive at this line of questioning because I was
            testing an LTSP
                 > client using a Lubuntu LTSP server configured with
            1 GB, and when
                 I drop
                 > the client memory configuration to 256 MB, the
            *server* has hung on
                 > several occasions when I was starting or stopping
            Firefox on the
                 client
                 > (though in one case this coincided with the startup
            of a SpiderOak
                 > backup operation).   I didn't think of the Magic
            SysRq keys at the
                 time,
                 > and nothing else was responding, so I did hard
            shutdowns.
                 >
                 > I saw a post from Phill Whiteside recently
            concerning a rush of
                 activity
                 > re a zram bug, but it seemed to be directed at Saucy.
                 >
                 > Are there solutions/workarounds?
                 >
                 You find a lot of details reading the comments about
            this bug.

            https://bugs.launchpad.net/bugs/1227202

                 There is a kernel in the pipeline, that we think will
            solve most if not
                 all of the problems. Until we get the kernel that can
            cooperate with
                 zRAM, you can switch it off either manually or with
            crontab like this:

                 guru@Lubuntu-Saucy-b2:~$ sudo crontab -l |tail -n3
                 # m h  dom mon dow   command
                 @reboot              /sbin/swapoff /dev/zram*
                 @reboot              /sbin/rmmod zram

                 Best regards
                 Nio

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-- https://wiki.ubuntu.com/phillw

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