- From: Frank Mori Hess <fmhess_at_users.sourceforge.net>
- Date: Tue, 23 Mar 2004 19:50:29 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tuesday 23 March 2004 05:42 am, Vitor Angelo wrote: > > An additional information is that I've tested with PCIDMA disabled and > enabled in comedi/drivers/ni_pcimio.c. It's not possible to use with DMA > because latencies are too big and the "long sleep" problem happens just > a few minutes after the program starts. Would you clarify what you mean by the latencies being too big with dma enabled? > > I've also performed a lot of "torture" tests (with disk and network IO) > and the callback latency always remained below 30us (20us in a idle > system). The 1ms glitches always happened after one hour running the > program with the system idle. > That sounds pretty suspicious. Does your computer have a bios setting to put the machine into low-power mode after an hour idle? - -- Frank -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQFAYNtV5vihyNWuA4URAiG2AKDARVLj7i5VUPBsnX9uFpxeKvSSLACcDNXb /YGBUWutwoxYQa7q8fXZTIM= =zrKC -----END PGP SIGNATURE-----
Received on 2004-03-24Z00:50:29