Kernel 3.15 contains some intel_pstate changes that should address the
issues I raised in post 16 above.
For Ubuntu one concern is: For the 250 Hz kernel the default sample rate
will result in an actual different sample rate, and thus the response
curve is a little different than for the 1000 Hz
For the decision to re-enable the intel pstate driver by default or not,
the suggestion is to be cautious. The driver keeps changing in rather
fundamental ways, such that one can never be sure how it is going to
perform. I will attach two graphs to (hopefully) help make my point.
The first graph
Graph 2 of 2. see previous comment.
** Attachment added: Sleep / load frequency sweep from 2 to 250 Hertz. Kernel
3.12 and 3.15RC2
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647/+attachment/4097699/+files/k315rc2_k312_freq_sweep.png
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The issue is that all of those kernels work, the issue does not appear
until the kernel configuration changes between saucy and trusty, as
mentioned in my original posting.
Without even knowing a good starting point, I tried a kernel bi-section,
but with the new configuration and went back as far
After a month, and off course, I checked that the issue was still
present with an up to date system when I added notes to this bug report
a couple of hours ago, right?
Well, due to incompetence on my part, I was not running the current
14.04 kernel, when I thought I was.
This issue is fixed
@ Joseph Salisbury: Thank you for the suggestions.
I would like to try to bisect the kernel. I am setup with GIT for my
kernel.org version of the kernel. I have tried to bisect the kernel 3
times before, and succeeded once. I will have to study GIT again to
remember how to do anything beyond git
I tried the Ubuntu kernel 3.13RC2, and the CPU user, sys, idle, and wait
information making no sense at all issue remains.
As I see it now, if there is a fb0 device, then the issue will exist:
doug@test-smy:~$ ls -l /dev/fb0
crw-rw 1 root video 29, 0 Dec 1 08:25 /dev/fb0
If there is not a
I have isolated the kernel configuration differences down to:
doug@v32-serv03:~/kernel/linux-3.12.0$ diff config_def config_05
781c781
CONFIG_X86_SYSFB=y
---
# CONFIG_X86_SYSFB is not set
4869c4869
CONFIG_FB_BOOT_VESA_SUPPORT=y
---
# CONFIG_FB_BOOT_VESA_SUPPORT is not set
4900c4900
I noticed some differences with the output of vmstat depending on the
delay parameter. The attachment is a loop of vmstat command for delay =
1 to 50 in steps of 1.
In a moment I will add the same thing but with the good kernel
configuration.
I have been trying to create a 14.04 i386 VM on my
** Attachment added: various delays on vstat - good config
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1254920/+attachment/3918412/+files/vmstat_loop_good.log
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Yes, I already tried kernel 3.13RC1 a couple of days ago, and it was the
same. I tried the one from the Ubuntu kernel PPA, not the one directly
from kernel.org (as I mentioned in an earlier post, I can not compile
the kernel on this computer).
I tried many many kernels in an attempt to isolate
** Attachment added: sudo lspci -vnvn lspci-vnvn.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1254920/+attachment/3917141/+files/lspci-vnvn.log
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** Attachment added: kernel config differences between saucy and trusty
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1254920/+attachment/3917140/+files/diff_config_saucy_trusty
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To clarify, I am suggesting that the reported numbers are incorrect, not
that there is some strange new loads going on.
I did many tests with disk I/O and CPU loading and such to determine if
there were any real increased overheads. Maybe a couple of percent of
CPU OS increased overhead and a
apport-collect has never worked for me on server computers. I end up in
some mess with my putty SSH connection and have never been able to
figure it out.
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This one can be set to Fix released. Does anyone disagree?
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https://bugs.launchpad.net/bugs/1215665
Title:
With Kernel 3.11RC6 Ubuntu servguide PDF compile crashes
Status
Please know when using the acpi-cpufreq driver what is shown in various
places for CPU frequency can be wrong. The only way to know the actual
CPU frequencies is via turbostat, as you are doing.
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By the way, ondemand mode using the acpi-cpufreq driver is working fine
on my computer with a 3.11 kernel.
doug@s15:~/temp$ uname -a
Linux s15 3.11.2-031102-generic #201309262136 SMP Fri Sep 27 01:37:33 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
doug@s15:~/temp$ cat
All active cores share the same frequency. This is one of the misleading
things about the acpi-cpufreq driver, it tends to show target
frequencies not actual frequencies.
See also the Intel 2nd gen core desktop vol 1 datasheet - Chapter 4
Power Management - Section 4.2 Processor Core Power
Public bug reported:
I often run the current release candidate (RC) on a 12.04 server computer.
When compiling any non-english PDF version of the Ubuntu server guide, one of
the programs crashes (and creates a log, which I will attach shortly, but
summary below). While it has been a very long
One of the crash log files.
** Attachment added: One of the crash log files
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1215665/+attachment/3783402/+files/hs_err_pid3025.log
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** Attachment added: sudo lspci -vnvn lspci.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1215665/+attachment/3783403/+files/lspci.log
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apport-collect has never worked for me. Right now, and after entering
apport-collect 1215665 I have some weird stuff on my puTTY session
screen and I can not seem to find any way to either log in to launchpad
from there or exit.
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
I am well aware of what you wrote. I was simply trying to help.
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https://bugs.launchpad.net/bugs/1215665
Title:
With Kernel 3.11RC6 Ubuntu servguide PDF compile crashes
This issue occurs also with Kernels 3.10.8 and 3.10.9, but not 3.10.7.
I was not looking for support with this bug report, I was wanting to
make developers aware that something has gone wrong in just the last few
days.
In my opinion, I can not file a bug at bugzilla because: I do not know
the
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