On Thu, 2001-11-08 at 07:31, Maarten de Boer wrote:
> Not understanding why I could not get alsa-lib/test/latency.c to work
> well, I decided to run Benno's latency test. It has been a long time
> since I did... The results are surprising, and nothing like the excellent
> results I have seen posted here.
>
> $ ./do_tests none 3 128 0 256
>
> http://193.145.55.36/latencytest/
>
> (yes, I use a very small size for the disk tests, but even then!)
>
> Something is definitely very wrong here. I am running kernel
> 2.4.13 patched with preempt-kernel-rml-2.4.13-2.patch
>
> $ cat /proc/cpuinfo
>
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 6
> model : 2
> model name : AMD Athlon(tm) Processor
> stepping : 1
> cpu MHz : 704.936
> cache size : 512 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36
>mmx fxsr syscall mmxext 3dnowext 3dnow
> bogomips : 1405.74
>
> I will check now what happens with 2.4.14 and Andrews LL patch...
>
> Maarten
I've heard that the PE patch doesn't get as low latency as the LL
patches. The last 3 graphs in your test are rather short, looks like its
because you specified 256 for the disk copy tests. Note that this is in
bytes, so its only reading/writing/copying 256 bytes, which doesn't take
that long :) You probably want 256000000.
--
Josh Green
Smurf Sound Font Editor (http://smurf.sourceforge.net)
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