** Changed in: linux (Ubuntu)
Assignee: Colin Ian King (colin-king) => (unassigned)
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Title:
Enable intel_pstate by default on Trusty EC2
Agreed that this is an issue with acpi-cpufreq.
turbostat is broken on Trusty:
$ sudo turbostat
/dev/cpu/0/msr offset 0x641 read failed
But using Brendan Gregg's msr-cloud-tools [1] it seems we are actually
running at max frequency (with intel_idle.max_cstate=0
processor.max_cstate=0 but without
Isn't there another issue within this bug report? Why doesn't the acpi-
cpufreq frequency scaling driver support the higher available clock
frequencies?
Actually, maybe it does. Observe processor 3 from the cpuinfo listing:
processor : 3
...
cpu MHz : 2901.000
It is in turbo mode.
Ping, any updates on this?
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Title:
Enable intel_pstate by default on Trusty EC2 AMIs
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We have tested the patched kernel on one network intensive (high packet)
workload with max_cstate=1 and ondemand governor disabled and it has
lower network throughput than the default kernel had with
intel_pstate=enable. There also appears to be a futex performance issue
with the c4.8xlarge which
Enabling intel-pstate on the 3.13 kernel was deemed problematic for
several reasons. However, I have backported all of the changes upto
4.2-rc8 to 3.13 and re-enabled the intel-pstate driver for testing. I
have performed a boot smoke test with this kernel and I think it needs
some deeper
** Changed in: linux (Ubuntu)
Status: Confirmed = In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Colin Ian King (colin-king)
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** Project changed: ubuntu-on-ec2 = linux-meta (Ubuntu)
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Title:
Enable intel_pstate by default on Trusty EC2 AMIs
To manage notifications about
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
** Tags added: kernel-da-key
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Title:
Enable intel_pstate by default on Trusty
** Package changed: linux-meta (Ubuntu) = linux (Ubuntu)
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Title:
Enable intel_pstate by default on Trusty EC2 AMIs
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Colin,
I read that you were considering[1] enabling it during t+1 and I wanted
your opinion for enabling it in Trusty on EC2 images at this time.
Also, what testing were you doing to evaluate this previously? Thanks.
[1] https://lists.ubuntu.com/archives/kernel-team/2014-April/040795.html
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apport information
** Tags added: apport-collected ec2-images
** Description changed:
Please can the intel_pstate driver be enabled by default on the Ubuntu
EC2 AMIs. On instances with support for C-states and P-States [1] there
is a notable performance impact and lack of support for
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