At 02 Oct 2001 14:25:03 -0700, Josh Green wrote: > > On Tue, 2001-10-02 at 10:33, Takashi Iwai wrote: > > Hi, > > > > i'm trying to run latency test for ALSA9 (based on Benno's latency > > suite) on my kernel to measure the latency with preemption and LL > > kernel patches. > > however, the test program hangs up almost always in the middle during > > disk write tests of 500 MB. > > I first though that this is related with VM and happens when the > > memory becomes full. But it's not true. This happens even if there > > are enough memory left unused. > > > > This appears only on 2.4.10 kernel. Looks like 2.4.9 kernel works > > fine. > > > > Could somebody test the program too? Of course, be prepare for hang > > up before you try :) > > > > The latency test program can be found at: > > http://www.alsa-project.org/~iwai/latencytest-0.42+alsa.tar.bz2 > > > > > > ciao, > > > > Takashi > > > > What are you using for your LL patch? It looks like Andrew Morton's > patch is only up to 2.4.9. I've applied his 2.4.9 patch to 2.4.10, but > there are a lot of rejects which I'm currently fixing up to the best of > my knowledge.
It's my hacking version (applied not to vanilla but SuSE's kernel). The kernel itself works flawlessly, but obviously it doesn't work as expected during heavy disk write. I experienced periodical peaks up to 6 msec. The disk read and proc load are quite ok. It's interesting to compare the results between LL and PE patches. Usually PE kernel shows much better responce than LL kernel on my tests. The latency is less than 100 usec, while the LL kernel has usually 200-500 msec usecs latency. But both kernels have almos same level peaks in disk write/copy... I'll check this problem futhre when I have time.. ciao, Takashi _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
