Messages in this thread | | | Subject | Re: A/D converter | Date | Wed, 21 Apr 1999 08:21:50 +0200 (MEST) | From | (Rogier Wolff) |
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> On Tue, Apr 20, 1999 at 01:13:40PM -0400, Richard B. Johnson wrote: > > There is, furthermore, no reason to do so. The fact that the original > > inquiry was about an ADC that "ran" at 70 kHz, means nothing about > > the speed at which it was expected to interrupt. In fact, the > > maximum rate at which you can interrupt Linux, and record that an > > interrupt occurred in your ISR (nothing else), is almost, but not > > quite, 50 kHz on a dual pentium running 400 MHz with a 100 Mhz main > > bus. I have a device-driver module which does little more than measure > > these kinds of things if you are interested.
A Pentium-100 SBC, on a passive-ISA backplane can do about 140k interrupts per seconds.
The case where I tested this, I had to do a few ISA IOs to acknowledge the interrupt, so the interrupt routine was NOT completely empty.
This was autumn '96. I think the machine runs 2.0.18.
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* ------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------
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