Hello, Thank you for updating this very interresting post. Do you have any website where you update the status of your work, publish som test codes ?
Cheers On Thu, Sep 4, 2008 at 5:52 PM, Jens M Andreasen <[EMAIL PROTECTED]>wrote: > Some time ago I mentioned having this performance problem: > > On Mon, 2008-08-25 at 20:48 +0200, Jens M Andreasen wrote: > > For 1024 bytes the transfer will take about 0.2 ms. That is 20% of the > > available time if we use a time granularity of a single millisecond. > > OTOH this appears to be mostly an intial constant, (much) more data can > > be transferred in the exact same amount of time if that is what is > > needed. > > I have since then updated to kernel 2.6.24.7-rt.17 (and compiled for > this systems E1200/Core2) > > This by itself doubled the throughput, so the upload would be done in > approx 100us (or better.) > > By chance I then tried to run the test back from runlevel 3? This got me > down to 25us! ... which also happens to be the target I had been aiming > for. > > A minimal X-setup, as in: > > $ startx /usr/bin/xterm -- :1 -depth 16 > > .. yields the same fine results, and so does a lightweight environment > like IceWM. > > But running the (default) Gnome Desktop Environment is consistently > quadrupling latencies from main to graphics memory? I have no idea what > is going on here, but kicking out gnome seems to solve the problem. > > > /jens > > _______________________________________________ > Linux-audio-dev mailing list > [email protected] > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev >
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