Lähettäjä: Alessandro Selli Päiväys: Vastaanottaja: dng Aihe: Re: [DNG] Devuan for Raspberry Pi fried SD CARD.
On 02/12/18 on 13:08, info at smallinnovations dot nl wrote: >
> If you disable journalling on ext4 you can just as well mount it with
> ext2 afaik.
>
> Grtz
>
> Nick
>
No, ext2 is significantly slower than a journal-less ext4 filesystem.
This must be due mainly to the fact that ext4 uses an improved
block-allocator algorithm, one that merges the allocation of a series of
blocks to the same file in one run instead of $FILE_SIZE/$BLOCK_SIZE
runs. I recently run a comparison test on an old 1GB USB pendrive
connected to a USB-2 port, here you are with the log:
if mountpoint --quiet "$TESTROOT"
then I=0
while test "$I" -lt "$MAXDIRS"
do mkdir "$TESTROOT/Dir_$I" || break
I=$((I+1))
done
I=0
while test $I -lt "$MAXDIRS"
do J=0
while test $J -lt "$MAXFILES"
do dd count=$((1024+16*J)) if=/dev/zero
of="$TESTROOT/Dir_$I/file_$J"
J=$((J+1))
done
I=$((I+1))
done
else echo "ERROR: \"$TESTROOT\" does not exist or is not a mountpoint" >&2
exit 1
fi
[alessandro@wkstn02 ~]$ time (bomb_filesystem.sh ; sync)
real 3m39,434s
user 0m1,024s
sys 0m1,950s
[alessandro@wkstn02 ~]$ time (\rm -r /mnt/loop/Dir_* ; sync)
real 0m2,486s
user 0m0,002s
sys 0m0,082s
--
Alessandro Selli <alessandroselli@???>
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