** Changed in: linux (Debian)
Status: Confirmed => Fix Released
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Title:
32-bit kernel HDD slow write speed
To manage notifications about
I can confirm the same problem for me (however the system in question is
actually Fedora 27, but no other online source provided a solution
except for this bug report):
kernel: 4.10.10 SMP PREEMPT i686 (32bit)
compiled with gcc_7.3.1
started with write speeds at around 180 MB/s and within minut
** Changed in: linux (Debian)
Status: Unknown => Confirmed
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Title:
32-bit kernel HDD slow write speed
To manage notifications about this
** Bug watch added: Debian Bug tracker #876035
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876035
** Also affects: linux (Debian) via
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876035
Importance: Unknown
Status: Unknown
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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.13 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix t
** Package changed: linux-meta (Ubuntu) => linux (Ubuntu)
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Title:
32-bit kernel HDD slow write speed
To manage notifications about this bug go t
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-meta (Ubuntu)
Status: New => Confirmed
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Title:
** Also affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
** Tags added: trusty xenial
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Title:
32-bit kernel HDD slow wri
I originally reported this issue in
https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1698118.
Just now I found this bug report so I'm marking mine as duplicate.
In the meantime, I had reported it upstream in the kernel in:
https://bugzilla.kernel.org/show_bug.cgi?id=196157
Thanks to the
This bug still exists in even 4.4.0-xx x86 kernels, but the slow HDD
writes disappears after I changed to amd64 kernel of the same versions
even the userland is still 32-bit.
I did like as below.
sudo dpkg --add-architecture amd64
sudo apt-get update
sudo apt-get install linux-image-generic:amd64
I ran into the same problem under Slackware. What fixed it for me was
changing the user/kernel memory split from 3G/1G to 2G/2G. Details
here: http://flaterco.com/kb/PAE_slowdown.html
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for a work around see post by Volker Siegel Aug 3 '14 at 22:40 in
http://unix.stackexchange.com/questions/17936/setting-proc-sys-vm-drop-caches-to-clear-cache
:
$ sync
$ echo 3 | sudo tee /proc/sys/vm/drop_caches
brings HDD write speed up again. I'm running 16.04 LTS; 4.4.0-22-generic
#40-Ubuntu
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-meta-lts-trusty (Ubuntu)
Status: New => Confirmed
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I have had a similar problem recently, although not with Ubuntu. When
the speed starts to go very slow, try doing:
echo 1 > /proc/sys/vm/drop_caches
I think there may be a kernel bug related to buffers which causes this
slowdown when the buffers are full.
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I've tried with different mem= values. I can go all the up to mem=18GB, and
keep a write speed of ~256MB/s using the command "dd if=/dev/zero of=/test.raw
bs=1M count=1000", but 19GB the write speeds starts to drop:
2GB = ~256MB/s
[...]
18GB = ~256MB/s
19GB = ~232MB/s
20GB = ~170MB/s
21GB = ~4.6
Sorry this is linked to the wrong package - it should be linked to the
kernel
** Package changed: gnome-keyring (Ubuntu) => linux-meta-lts-trusty
(Ubuntu)
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