Hi all,
The memory buffer we are telling comedi to use (using --read-buffer option of comedi_config) is 8MB (--read-buffer 8192)
Any help more?
Thanks
-- Daniel Machón [damachon_at_eresmas.net] --
----- Mensaje Original -----
Remitente: Frank Mori Hess fmhess_at_users.sourceforge.net
Destinatario: damachon_at_eresmas.net, comedi_at_comedi.org
Fecha: Sábado, Noviembre 29, 2003 0:01am
Asunto: Re: TWO PXI 6070E have problems to adquire at high speed
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>On Friday 28 November 2003 07:05 am, David wrote:
>> Hi all,
>>
>> We have in our system REDHAT 9, kernel 2.4.22 vanila, patch adeos,
>RTAI> 24.1.12, and the latest CVS comedi version. We are testing comedi
>> adquiring at 1.25Ms/s. If we use only one PXI 6070E card we have
>not any
>> problem to adquire at that speed, but when we use two cards (PXI
>6070E)> the adquisition of one of the cards is stopped (both cards
>at 1.25Ms/s).
>> The other card continues working perfectly.
>>
>> We think that comedi moves data to their buffer when one card has a
>> number of samples greater than PAGE_SIZE (4096) ¿is it right?
>>
>> If that is true, we think too, that increasing the number of
>samples to
>> read at a time (for example 16K instead of 4K) we will improve the
>> system, and adquiring from two cards at 1.25Ms/s each, will work.
>> ¿what do you think about that idea?
>
>It seems unlikely to me that the board's hardware fifos are
>overflowing,
>since they are being emptied by their pci chips using dma. How big
>a
>memory buffer are you telling comedi to use (see the --read-buffer
>option
>of comedi_config)?
>
>- --
>Frank
>
>-----BEGIN PGP SIGNATURE-----
>Version: GnuPG v1.0.6 (GNU/Linux)
>Comment: For info see http://www.gnupg.org
>
>iD8DBQE/x9PX5vihyNWuA4URAnrxAJ4yAz9JKGqhugJ5Hyw/m9YVe98koACfauJ6
>ySVNMMRXnGEceuFLkYdlj6E=
>=g8hq
>-----END PGP SIGNATURE-----
>
>
>_______________________________________________
>comedi mailing list
>comedi_at_comedi.org
>https://cvs.comedi.org/cgi-bin/mailman/listinfo/comedi
> |