I no longer have access to this hardware to get the full computer model,
but the referenced test programs should be able to reproduce the issue
on most, if not all machines (it's worked on everyone I've tried it on
to date).
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** Changed in: linux (Ubuntu)
Importance: Medium = Low
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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https://bugs.launchpad.net/bugs/1058854
Title:
High CPU
Dave Johansen, could you please provide the full computer model as noted
on the sticker (ex. HP Pavilion dm4-2015dx Entertainment Notebook PC)?
** Changed in: linux (Ubuntu)
Status: Confirmed = Incomplete
** Tags added: needs-full-computer-model
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I installed the kernel with the BFS scheduler and other CK modifications
from https://launchpad.net/~chogydan/+archive/ppa and ran the test.
The performance at the low number of threads shows the same gap, but
once the thread count hits the number of cores, the gap basically closes
completely, so
** Attachment added: Wall Time for BFS kernel
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3371313/+files/ubuntu_12.04_bfs_gettimeofday.svg
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** Attachment added: Wall Time for BFS kernel when running schedtool
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3371315/+files/ubuntu_12.04_bfs_schedtool_gettimeofday.svg
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** Attachment added: User time for BFS kernel
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3371314/+files/ubuntu_12.04_bfs_usertime.svg
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** Attachment added: User time for BFS kernel when running schedtool
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3371316/+files/ubuntu_12.04_bfs_schedtool_usertime.svg
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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I ran it with the 3.6 kernel and it gave basically identical results. I
didn't attach the plots because they didn't show anything meaningful or
new, but I can if you would like.
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
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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
v3.6 kernel[0] (Not a kernel in the daily directory) and install both
the linux-image and linux-image-extra .deb packages.
Once you've tested the
** Attachment added: Plot of wall time
https://bugs.launchpad.net/bugs/1058854/+attachment/3356798/+files/ubuntu_12.04_gettimeofday.svg
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** Attachment added: Plot of user time
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3356821/+files/ubuntu_12.04_usertime.svg
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** Attachment added: Plot of wall time when running schedtool
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3356822/+files/ubuntu_12.04_schedtool_gettimeofday.svg
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** Attachment added: Plot of user time when running schedtool
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+attachment/3356823/+files/ubuntu_12.04_schedtool_usertime.svg
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** Changed in: linux (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1058854
Title:
High CPU usage of CFS
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