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[Bug 1751264] Re: qemu-img convert issue in a tmpfs partition
From: |
Thomas Huth |
Subject: |
[Bug 1751264] Re: qemu-img convert issue in a tmpfs partition |
Date: |
Wed, 21 Apr 2021 06:28:08 -0000 |
The QEMU project is currently considering to move its bug tracking to another
system. For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state
back to "New" within the next 60 days, otherwise this report will be marked as
"Expired". Or mark it as "Fix Released" if the problem has been solved with a
newer version of QEMU already. Thank you and sorry for the inconvenience.
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1751264
Title:
qemu-img convert issue in a tmpfs partition
Status in QEMU:
Incomplete
Bug description:
qemu-img convert command is slow when the file to convert is located
in a tmpfs formatted partition.
v2.1.0 on debian/jessie x64, ext4: 10m14s
v2.1.0 on debian/jessie x64, tmpfs: 10m15s
v2.1.0 on debian/stretch x64, ext4: 11m9s
v2.1.0 on debian/stretch x64, tmpfs: 10m21.362s
v2.8.0 on debian/jessie x64, ext4: 10m21s
v2.8.0 on debian/jessie x64, tmpfs: Too long (50min+)
v2.8.0 on debian/stretch x64, ext4: 10m42s
v2.8.0 on debian/stretch x64, tmpfs: Too long (50min+)
It seems that the issue is caused by this commit :
https://github.com/qemu/qemu/commit/690c7301600162421b928c7f26fd488fd8fa464e
In order to reproduce this bug :
1/ mount a tmpfs partition : mount -t tmpfs tmpfs /tmp
2/ get a vmdk file (we used a 15GB image) and put it on /tmp
3/ run the 'qemu-img convert -O qcow2 /tmp/file.vmdk /path/to/destination'
command
When we trace the process, we can see that there's a lseek loop which
is very slow (compare to outside a tmpfs partition).
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