On 2014-09-30 10:41, Alexander E. Patrakov wrote:
30.09.2014 14:21, David Henningsson wrote:
I did a quick test here. I have an old laptop that runs Ubuntu 12.04,
with default installed PulseAudio 1.1. Its processor is Intel Pentium M
@ 1.4 GHz [1], single core, with an AC'97 codec.
Running speaker-test will automatically cause resampling from 48 kHz
down to 44.1 kHz, as verified with "pactl list sink-inputs".
Under speex-float-1, PulseAudio consumes about 4.3% CPU. With
speex-float-3, PA consumes ~8% CPU. With speex-float-5, PA consumes ~13%
CPU.
OK. Given that Ubuntu provides the SSE2-optimized library for speex on
i386,
My CPU seems to include sse2 instructions according to /proc/cpuinfo.
Does speex provide both a sse2 and a non-sse2 implementation, and
switches dynamically depending on CPU, or is it set at compile time? If
the latter, i e, if Ubuntu could only ship one implementation by
default, then probably it would choose the non-sse2 version. I think.
I think that our results are comparable. Could you please also
show the actual CPU frequency, if the power-saving features of the
platform allow the kernel to decrease it?
Uhm. I just checked /sys/devices/system/cpu/cpu0/cpufreq while
speaker-test was running, and it seemed to alternate frequently between
600000, 800000, 1000000, and 1200000.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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