Re: [Bug 192571] zswap + zram enabled BUG

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On Wed, Jan 18, 2017 at 12:58 AM, Alexandr <sss123next@xxxxxxx> wrote:
> no, nothing interesting in dmesg. but i suspect what it may be because
> of usage zram and zswap together.
> i have following configuration:
> 1. boot option to kernel "ro radeon.audio=0 dma_debug=off reboot=warm
> gbpages rootfstype=ext4
> rootflags=relatime,user_xattr,journal_async_commit,delalloc,nobarrier
> zswap.enabled=1"
> 2. zram activation in userspace:
> "
> cat /etc/local.d/zram.start
> #!/bin/sh
>
> modprobe zram
> echo 10G > /sys/block/zram0/disksize
> mkswap /dev/zram0
> swapon --priority 200 /dev/zram0

Why would you do this?  There's no benefit of using zswap together with zram.


> "
>
> 3. also i have normal swap block device as fall back if all memory used
> "
> swapon
> NAME             TYPE      SIZE USED PRIO
> /dev/mapper/swap partition  16G   0B    0
> /dev/zram0       partition  10G   1G  200
> "
>
> so, maybe problem related to zswap on zram ? just a guess...

it think it's unlikely, but it's hard to tell exactly why the page
couldn't be uncompressed; my guess would be more likely a bug in the
zpool backend.  Were you using the default (zbud)?

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