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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915_init takes over 100 ms"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105622#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - i915_init takes over 100 ms"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105622">bug 105622</a>
from <span class="vcard"><a class="email" href="mailto:pmenzel+bugs.freedesktop@molgen.mpg.de" title="Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de>"> <span class="fn">Paul Menzel</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=138291" name="attach_138291" title="Screenshot from HTML output of `bootgraph.py`">attachment 138291</a> <a href="attachment.cgi?id=138291&action=edit" title="Screenshot from HTML output of `bootgraph.py`">[details]</a></span>
Screenshot from HTML output of `bootgraph.py`
(In reply to David Weinehall from <a href="show_bug.cgi?id=105622#c8">comment #8</a>)
<span class="quote">> From past experience I'd say that initcall_debug alone isn't a very useful
> means to measure this. There's a tool called pm-graph that's great for
> things like this.
>
> <a href="https://github.com/01org/pm-graph">https://github.com/01org/pm-graph</a>
>
> With that (in ftrace mode) I'm seeing roughly 35ms on the Broadwell I tested
> on. I can test on KBL too, if you believe it'll make a difference (the BDW
> was simply closest at hand).</span >
I know about pm-graph and the script `bootgraph.py` – you told me about the
script (new name) `sleepgraph.py` in another report, if I remember correctly.
;-)
Anyway, the times of initcall_debug and `bootgraph.py` match. This time I I
measured it both show 50 ms, which is still quite a lot.
<span class="quote">> i915_init: start=4474.445, end=4525.887, length(w/o overhead)=50.175 ms, return=0</span >
These 50 ms are spent in `generic_hdmi_init` of `snd_hda_codec_hdmi`.</pre>
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