Re: [microblaze-uclinux] FSL Driver Overhead

[Aurash <aurelian.lazarut@xxxxxxxxxxx>]

Claudio,

from the kernel space you can use

printk(KERN_INFO "bla bla!\n");

Aurash


Jonathan Jung wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi Claudio,
>
> One question regarding the counter:
>
> I'm not really familiar with Linux driver development, but is there  
> an easy way to gain access to printf from inside the driver  
> (fslfifo.c)?  Including uClib's stdio.h leads to a large mess of  
> files that would have to be copied/symlinked to different locations.
>
> Should I be reading the value of the counters a different way?
>
> Thanks,
>
> Jonathan
>
>
> On Jan 3, 2006, at 2:55 AM, Claudio Lanconelli wrote:
>
> > Jonathan Jung wrote:
> >
> > > As you can see, software version consumes 1m 33 s of CPU time  
> > > running the openssl code. The hardware/software combo takes only  10 
> > > seconds of time executing the openssl code, but requires 1  minute 
> > > and 56 seconds of overhead in unrelated system calls, I'm  sure is 
> > > because of the reading and writing to the FSL.
> >
> >
> > Reading/writing to FSL takes time only when the FSL FIFO if full on  
> > writing or empty on reading.
> > Be sure your FSL FIFO is depth enough. Then you can count how many  
> > times the driver wait on the
> > fifo by adding a couple of counters like this:
> >
> > write_tasklet_func:
> >
> > fsl_nput(fsl_fifo->id, value, fsl_status);
> > if(fsl_nodata(fsl_status))
> > {
> > write_full_counter++;
> > do_reschedule++;
> > break;
> > }
> >
> > read_tasklet_func:
> >
> > fsl_nget(fsl_fifo->id, val, fsl_status);
> > if(fsl_nodata(fsl_status))
> > {
> > read_empty_counter++;
> > break;
> > }
> >
> > Try it and report the counters value
> >
> > Happy new year,
> > Claudio Lanconelli
> > ___________________________
> > microblaze-uclinux mailing list
> > microblaze-uclinux@xxxxxxxxxxxxxx
> > Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze- uclinux
> > Mailing List Archive : http://www.itee.uq.edu.au/~listarch/ 
> > microblaze-uclinux/
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.1 (Darwin)
>
> iD8DBQFDu4Dd4kOt3FHegqgRAtgzAJwP8BfAWhlyphrZJiRKQg1BqMKD1ACglH9O
> k9Ejyjeb+M5qmJnm5sTHtFo=
> =Jo9p
> -----END PGP SIGNATURE-----
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@xxxxxxxxxxxxxx
> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive : 
> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/