[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

*** This bug is a duplicate of bug 1333294 *** https://bugs.launchpad.net/bugs/1333294 ** 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

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

*** This bug is a duplicate of bug 1333294 *** https://bugs.launchpad.net/bugs/1333294 I marked this as a duplicate of bug #1333294. Especially the link mentioned there, http://flaterco.com/kb/PAE_slowdown.html, has a very nice overview of the problem AND of the possible workarounds. I

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

Hi Andrew, noone is watching this bug report, please comment in the upstream bug if you want the kernel developers to listen to your feedback. https://bugzilla.kernel.org/show_bug.cgi?id=196157 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

Thanks. Running sync && echo "1" | sudo tee /proc/sys/vm/highmem_is_dirtyable on my system improves the situation for intensive read / write, but does not solve the problem. Here are my test results after running the above commands. I should be seeing 4s and 5s all the way down, but instead I

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

I reported the bug upstream in the Linux kernel: https://bugzilla.kernel.org/show_bug.cgi?id=196157 The suggested a workaround of "echo 1 > /proc/sys/vm/highmem_is_dirtyable", which eliminates the issue, although "it can lead to a premature OOM killer invocations". ** Bug watch added: Linux

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

As promised here are the results from the amd64 live DVD (the architecture identifies as 'i386' but this is the default desktop install media identifying as 'amd64') 16.04.2 LTS (Xenial Xerus), 4.8.0-36-generic, i386, RAM=16387048 Copying /lib to 1: 14.20 Copying 1 to 2: 4.24 Copying 2 to 3:

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

Yes it does affect me to When we are trying to run ltsp-update-image, it needs almost 40 minutes running with 16 GB RAM, and with 8 GB it needs only 3 minutes. results with 16GB RAM: real38m32.201s user14m16.988s sys0m24.548s results with 8GB RAM: real3m11.648s user

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

Results with modified method including sync on 32bit. Will repeat with 64bit live CD tomorrow evening. 16.04.2 LTS (Xenial Xerus), 4.8.0-54-generic, i386, RAM=16552604 Copying 1 to 2: 8.97 Copying 2 to 3: 7.36 Copying 3 to 4: 7.08 Copying 4 to 5: 6.51 Copying 5 to 6: 6.92 Copying 6 to 7: 7.33

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

And these are the results of the latest 4.12 mainline kernel. It keeps getting worse, `cp -a /lib /elsewhere` should need 5 seconds and it takes 800+. 16.04.2 LTS (Xenial Xerus), 4.12.0-041200rc5-generic, i386, RAM=16292588 [HD install] Copying /lib to 1: 65.18 Copying 1 to 2: 46.17 Copying 2 to

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

I updated my test case to include the "sync" call inside the "time", because otherwise recent 64bit installations report wrong results. @v4169sgr, you might want to test again with 64bit using the updated commands: 1) . /etc/os-release; echo -n "$VERSION, $(uname -r), $(dpkg

[Bug 1698118] Re: Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels

** Summary changed: - Slow disk writes after some uptime, only on certain hw and 4.4+ kernels + Slow disk writes after some uptime, only on 32bit/16+RAM/4+ kernels -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.