[Gta04-owner] ***UNCHECKED*** Re: suggestions for rootfs
H. Nikolaus Schaller
hns at goldelico.com
Fri Feb 3 12:56:08 CET 2017
> Am 03.02.2017 um 12:31 schrieb Andreas Kemnade <andreas at kemnade.info>:
> Hi Nikolaus,
> On Fri, 3 Feb 2017 09:32:17 +0100
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
>>> So this means that it could suffice to initially mount with -o
>>> compr=lzo which should create a compressed image and afterwards it
>>> should simply "know" about compression. Let's give this theory a
>> Well, it works using -o compr=lzo but makes no difference. Either
>> compression is already turned on or this method of creating a
>> compressed ubifs does not work.
> As far as I understand,
> mount -o compr=...
> defines the compression for newly-written files.
Ah, would this mean that ubifs can mix compressed and uncompressed files
by simply remounting?
> I mounted with compr=zlib.
> I ran a pipe yesterday:
> tar -c ... | buffer -z 512k | (cd /mnt/nand ; tar -x).
> I copied around 900MByte (according to buffer output.
> The usage df has reported grews initially quite fast, then very slowly.
Ok, I just looked at 'df' and there was no change in the total size
before writing anything.
So I should test with really copying files. Here is the result:
root at letux:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 7191060 1325660 5493456 20% /
devtmpfs 236328 0 236328 0% /dev
tmpfs 49008 288 48720 1% /run
tmpfs 5120 4 5116 1% /run/lock
/dev/mmcblk0p1 390740 10256 380484 3% /boot
tmpfs 98000 0 98000 0% /run/shm
cgroup 12 0 12 0% /sys/fs/cgroup
cgmfs 100 0 100 0% /run/cgmanager/fs
ubi0:gta04-rootfs 461948 451576 5536 99% /mnt/nand
root at letux:~# mount | fgrep nand
ubi0:gta04-rootfs on /mnt/nand type ubifs (rw,relatime,compr=lzo)
root at letux:~#
This means that lzo compression was already turned on.
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