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Message-ID: <20160524194544.GA18011@amd> Date: Tue, 24 May 2016 21:49:03 +0200 From: Pavel Machek <pavel@....cz> To: Nishanth Menon <nm@...com> Cc: pali.rohar@...il.com, sre@...nel.org, kernel list <linux-kernel@...r.kernel.org>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org, aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com, patrikbachan@...il.com, serge@...lyn.com Subject: Re: Can not play audio with screen off Hi! > > > I'm playing some more with N900, this time I'd like to use it as a > > > alarm clock... > > > > > > And now I realized I can not, because system performance is so > > > horrible with screen off that mpg123 + pulseaudio skips horribly. This > > > is without tweaking serial parameters, so CPU is definitely not going > > > into the idle/off modes. > > > > > > Loading CPU fixes the issue (I used cat /dev/zero > /dev/null). > > > > > > Hmm. And it seems to work better if I ssh in and launch mpg123 > > > remotely. Weird. > > > > > > Kernel 4.5-rc0. Will try on different ones. > > > > > > Any ideas? Is there interface to tell kernel that better performance > > > is needed for a while? > > > pm_qos cpu_dma_latency? Drivers will have to be properly instrumented > > with appropriate latency values -> this will control the depth in C > > states that the system will attempt. NOTE: it is a dual edged sword, > > bad configurations can result in none of the C-states being entered. > > Ok, so far it looks like artefact of -rc0 kernel. Lets see if it > reappers... Hmm. So it happens in vanilla 4.4, too... let me see if it happens in v4.6. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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