On Wed, Oct 21, 2009 at 5:53 PM, Karl Heyes <karl at xiph.org> wrote:>> I'm seeing quite a few wakeups/sec in icecast2 2.3.2 on Debian Testing. >> In fact, whether icecast is doing anything or not, powertop reports 44.3 >> wakeups per second. This is pretty big number, on my laptop it means >> icecast alone is responsible for every third wakeup on idle. > > This will vary depending on what you have icecast doing but you should find > that the trunk code has less wakeups. ?The connection and stats parts are > not quite the same as the kh tree, although they have been changed, so you > should see an improvement.Thanks, Karl. Testing with trunk I can confirm this. Just as before it doesn't seem to make difference if icecast streams something or not, but there is a significant improvement compared to 2.3.2: 2.3.2 44 wakeups/s trunk 13 wakeups/s 13 wakeups is still not optimal when in reality my icecast usually has nothing to do (no mounts, no clients), but it is a lot better. Thanks for the good work, - Jussi
Karl asked me to test with his kh17 branch and I did. It looks like this is the first time there is a difference between not doing anything and actually streaming (this could be a result of my very non-scientific testing but the numbers looked fairly constant). version ? ? wakeups/s when ? ? ? wakeups/s with ? ? ? ? ? ?idle (no mounts) ? ? 1 mount, 1 stream ------------------------------------------- 2.3.2 ? ? ? 44 ? ? ? ? ? ? ? ? ? 44 trunk ? ? ? 13 ? ? ? ? ? ? ? ? ? 13 kh17 ? ? ? ? 4 ? ? ? ? ? ? ? ? ? 10 This is a lot better for my use case case (mostly idle). Even the difference when streaming looks significant: the number of wakeups stays fairly stable over time so the 13 vs 10 difference should be a statistically significant one. - Jussi
...and one more test with kh17b. From 2.3.2 to kh17b the "wakeups/s"
figure has come down 84% - 98% in my test cases. I have very little
idea what Karl's been doing but from a user POV the results look very
good.
version wakeups/s when wakeups/s with
idle (no mounts) 1 mount, 1 stream
-------------------------------------------
2.3.2 44 44
trunk 13 13
kh17 4 10
kh17b 1 7
- Jussi