- From: Daniel Koch <danielkoch_at_gmx.net>
- Date: Thu, 7 Nov 2002 18:39:00 +0100
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Tim, My system is PC104 sized with a 586 AMD processor running at around 100MHZ, 32 MB RAM and a 32 MB chip disk. I set comedi_config /dev/comedi0 pc104-das16/jr16 0x220,3,3,10 read_buffer_size=4096 or higher. Raising the buffer size only delays the I/O error I get with cmd, so it doesn`t really solve the problem.. Daniel Am Donnerstag, 7. November 2002 18:12 schrieben Sie: > Hi, > > >I need to use realtime > > data aquisition, because I need the full sampling rate of 100KZH which is > > provided by the board. Without realtime I get I/O errors after some time > > even if I increase the read_buffer_size. > > I'm doing 10 times that rate with a NI PCI-6071E in userspace, so unless > you're using an 80MHz CPU I don't see why you're having a problem. > > Are you really increasing the buffer size? When the machine boots, I have > comedi_config increase the read buffer size, and then the application > itself also has to make a call to comedilib to increase the buffer size. (I > don't have comedi on this machine, so I can't remember function names.) Use > comedilib to check and see that you really have increased the buffer > size---you might be getting an error that you're not checking. > > Best, - -- - ---------------------------------------------------------------------- "Schlage die Trommel und fürchte dich nicht" (Heinrich Heine) Daniel Koch (danielkoch_at_gmx.net) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9yqU66i7okj1aOg0RAp4gAKDDSX2i43ur84zf0BISh0JnVc/aHwCg1Kbm KoiZDOCGBYm2B028i+at4cc= =tfAq -----END PGP SIGNATURE-----
Received on 2002-11-07Z17:39:00