Thanks for your response.
I'm so sorry for the test result has some error.
we has test the profermance of Linux on our mpc860 board with kernel 2.2.13.
result on 860 is
linux pSOS
VxWorks
for(;;) for local variable: 0.52 times/usec 23.81 times/usec 4.79
times/usec
for(;;) for global variable: 0.48 times/usec 9.58 times/usec 3.99
times/usec
while() for local variable: 0.57 times/usec 11.90 times/usec 5.78
times/usec
while() for global variable: 0.445 times/usec 11.90 times/usec 3.97 times/usec
result on Compiled "powerpc-linux-gcc -O2 "
linux pSOS
VxWorks
for(;;) for local variable: 1.52 times/usec 23.81 times/usec 4.79
times/usec
for(;;) for global variable: 0.79 times/usec 9.58 times/usec 3.99
times/usec
while() for local variable: 2.018 times/usec 11.90 times/usec 5.78
times/usec
while() for global variable: 0.908 times/usec 11.90 times/usec 3.97
times/usec
----- Original Message -----
From: Bernhard Kuhn <[EMAIL PROTECTED]>
To: Kulwinder Atwal <[EMAIL PROTECTED]>
Cc: shaolin zhang <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, March 30, 2000 5:28 AM
Subject: Re: [rtl] the performance of linux run on MPC860
> Kulwinder Atwal wrote:
> > shaolin zhang wrote:
> > > some result is:
> > Linux pSOS VxWorks
> >
> > > for(;;) for local variable: 0.52 usec/times 23.81 usec/times 4.79
>usec/times
> > > for(;;) for global variable: 0.48 usec/times 9.58 usec/times 3.99
>usec/times
> > > while() for local variable: 0.57 usec/times 11.90 usec/times 5.78
>usec/times
> > > while() for global variable: 0.445 usec/times 11.90 usec/times 3.97
>usec/times
> >
> > Does not a lower time mean it runs faster?
> > It sounds like linux is running faster than pSOS and VxWorks.
>
>
> At least, it is rather unclear what the meassured values
> want to say anyway: how do you messure the execution time
> of an endless loop? :-)
>
> Do you think this "Empty-Loop-Benchmarks" say anything usefull for
> a more complex application? I doupt, your main application
> is an endless loop without content (maybe, you posted the whole
> stuff in the linuxppc-mailinglist, but definitly not at
> the RTL-Mailinglist)
>
> BTW: RTLinux will not speed up the execution time of loops. This
> only depends on the compiler. RTLinux just reduces latencies&jitters
> and gives you guaranteed response times.
>
> Please, can you be a little more specific and tell us exactly
> how you did you performace tests including the code?
>
> Bernhard
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