Why overlayfs increases boot time?

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Recently, I started using overlay filesystem. I'm using initram script (init=/sbin/myint) as described in Raspberry blog - raspberry overlay, yet, I noticed that it increases boot time significantly (about 10 seconds).



Is this increase in time happening because of mounting overlay filesystem?



EDIT:



I see that if I do the mount in init script instead of fstab file, then the additional time is reduced. Yet, I am not sure what's the difference.
in fstab:



/dev/mmcblock5 /app ext4 defaults 0 0
overlay /app overlay defaults,lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2


(/temp is mounted in initram script (init=/sbin/myint), see the link above)
in /etc/local.d/01.start
:



mount -t overlay -o lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2 none /app





filesystems overlayfs







share|improve this question























  • Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
    – slm♦
    Aug 19 at 18:22










  • I use overlay, not overlay2.
    – ransh
    Aug 19 at 18:25










  • Try w/ overlay2 to see if that's the issue.
    – slm♦
    Aug 19 at 18:25






  • 1




    you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
    – sourcejedi
    Aug 19 at 19:51











  • I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
    – ransh
    Aug 20 at 7:52















up vote
1
down vote

favorite












Recently, I started using overlay filesystem. I'm using initram script (init=/sbin/myint) as described in Raspberry blog - raspberry overlay, yet, I noticed that it increases boot time significantly (about 10 seconds).



Is this increase in time happening because of mounting overlay filesystem?



EDIT:



I see that if I do the mount in init script instead of fstab file, then the additional time is reduced. Yet, I am not sure what's the difference.
in fstab:



/dev/mmcblock5 /app ext4 defaults 0 0
overlay /app overlay defaults,lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2


(/temp is mounted in initram script (init=/sbin/myint), see the link above)
in /etc/local.d/01.start
:



mount -t overlay -o lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2 none /app





filesystems overlayfs







share|improve this question























  • Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
    – slm♦
    Aug 19 at 18:22










  • I use overlay, not overlay2.
    – ransh
    Aug 19 at 18:25










  • Try w/ overlay2 to see if that's the issue.
    – slm♦
    Aug 19 at 18:25






  • 1




    you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
    – sourcejedi
    Aug 19 at 19:51











  • I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
    – ransh
    Aug 20 at 7:52













up vote
1
down vote

favorite









up vote
1
down vote

favorite











Recently, I started using overlay filesystem. I'm using initram script (init=/sbin/myint) as described in Raspberry blog - raspberry overlay, yet, I noticed that it increases boot time significantly (about 10 seconds).



Is this increase in time happening because of mounting overlay filesystem?



EDIT:



I see that if I do the mount in init script instead of fstab file, then the additional time is reduced. Yet, I am not sure what's the difference.
in fstab:



/dev/mmcblock5 /app ext4 defaults 0 0
overlay /app overlay defaults,lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2


(/temp is mounted in initram script (init=/sbin/myint), see the link above)
in /etc/local.d/01.start
:



mount -t overlay -o lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2 none /app





filesystems overlayfs







share|improve this question















Recently, I started using overlay filesystem. I'm using initram script (init=/sbin/myint) as described in Raspberry blog - raspberry overlay, yet, I noticed that it increases boot time significantly (about 10 seconds).



Is this increase in time happening because of mounting overlay filesystem?



EDIT:



I see that if I do the mount in init script instead of fstab file, then the additional time is reduced. Yet, I am not sure what's the difference.
in fstab:



/dev/mmcblock5 /app ext4 defaults 0 0
overlay /app overlay defaults,lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2


(/temp is mounted in initram script (init=/sbin/myint), see the link above)
in /etc/local.d/01.start
:



mount -t overlay -o lowerdir=/app,upperdir=/mnt/temp/upper2,workdir=/mnt/temp/work2 none /app





filesystems overlayfs




filesystems overlayfs






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Aug 20 at 7:56

























asked Aug 19 at 18:08









ransh

344249




344249











  • Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
    – slm♦
    Aug 19 at 18:22










  • I use overlay, not overlay2.
    – ransh
    Aug 19 at 18:25










  • Try w/ overlay2 to see if that's the issue.
    – slm♦
    Aug 19 at 18:25






  • 1




    you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
    – sourcejedi
    Aug 19 at 19:51











  • I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
    – ransh
    Aug 20 at 7:52

















  • Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
    – slm♦
    Aug 19 at 18:22










  • I use overlay, not overlay2.
    – ransh
    Aug 19 at 18:25










  • Try w/ overlay2 to see if that's the issue.
    – slm♦
    Aug 19 at 18:25






  • 1




    you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
    – sourcejedi
    Aug 19 at 19:51











  • I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
    – ransh
    Aug 20 at 7:52
















Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
– slm♦
Aug 19 at 18:22




Are you loading overlay or overlay2? - unix.stackexchange.com/questions/328978/docker-and-overlayfs.
– slm♦
Aug 19 at 18:22












I use overlay, not overlay2.
– ransh
Aug 19 at 18:25




I use overlay, not overlay2.
– ransh
Aug 19 at 18:25












Try w/ overlay2 to see if that's the issue.
– slm♦
Aug 19 at 18:25




Try w/ overlay2 to see if that's the issue.
– slm♦
Aug 19 at 18:25




1




1




you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
– sourcejedi
Aug 19 at 19:51





you could try comparing the output of systemd-analyze blame and/or systemd-analyze plot > plot.svg. It might show which parts of the boot process happen more slowly / later on.
– sourcejedi
Aug 19 at 19:51













I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
– ransh
Aug 20 at 7:52





I made some progress , I see that if I mount the overlay in init script instead of fstab, the additional time is reduced. quite strange. any idea what's the difference ? The question was edited
– ransh
Aug 20 at 7:52
















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