[QA] Release Meeting 2012-04-06

Steve Beattie sbeattie at ubuntu.com
Fri Apr 6 19:05:59 UTC 2012

[resending due to the messed up kernel team address in the prior message.]

On Fri, Apr 06, 2012 at 11:49:01AM -0700, Steve Langasek wrote:
> Cc:ing the kernel team; folks, there seems to be some strange behavior in
> the kernel that causes our boot speed tests to sometimes turn out much
> slower than normal.
> On Fri, Apr 06, 2012 at 11:54:49AM +0200, Jean-Baptiste Lallement wrote:
> > === Boot speed Testing ===
> > http://reports.qa.ubuntu.com/reports/boot-speed/
> > 1 run yesterday on AMD64 took 12 seconds more than the average to boot
> > http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-01/2012-04-05_14-14-20/bootchart.png
> > The same occurred on i386 on Mar. 31 (54.66s) and Apr. 01 (49.83s)
> > http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-01/2012-03-31_11-57-21/bootchart.png
> > http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-02/2012-03-31_14-25-29/bootchart.png
> > http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-01/2012-04-01_19-37-05/bootchart.png
> > http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-02/2012-04-01_15-13-56/bootchart.png
> This is very interesting.  Although most of the added time is attributed to
> the plumbing layer, when I look at dmesg for the two runs 
> (http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-01/2012-04-05_14-14-20/dmesg
> vs.
> http://reports.qa.ubuntu.com/reports/boot-speed/acer-veriton-01/2012-04-05_09-55-24/dmesg)
> and vdiff them, it's evident that the slower boot is showing itself to be
> slower very early on, starting with:

I don't know the answer to these, but I do note that bootchart
maintenance seems to have been overtaken by Auke Kok, and that in
his 1.15 release, he added support for graphing of kernel threads:


I wonder if that would help diagnose why things are slower in the
kernel portion of boot.  It seems that our bootchart package is based
on the last bootchart.org package released in 2005.

Steve Beattie
<sbeattie at ubuntu.com>
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