Messages in this thread | | | Date | Thu, 22 Apr 1999 13:52:43 +0300 | From | Catalin Muresan <> | Subject | Re: A/D converter |
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Hello,
On Tue, Apr 20, 1999 at 01:13:40PM -0400, Richard B. Johnson wrote: root> the speed at which it was expected to interrupt. In fact, the root> maximum rate at which you can interrupt Linux, and record that an root> interrupt occurred in your ISR (nothing else), is almost, but not root> quite, 50 kHz on a dual pentium running 400 MHz with a 100 Mhz main root> bus. I have a device-driver module which does little more than measure root> these kinds of things if you are interested. root> root> Cheers, root> Dick Johnson
I understand by this that you could not have, let's say, 60k interrupts in Linux on a slower machine, which is interesting because we have two systems here that handle about 60k interrupts/sec on average (coming from two sources) and the system load is low.
[spot@spot spot]$ grep spot /proc/interrupts ; sleep 1; grep spot /proc/interrupts 7: 24448279 + spot 10: 3015770449 + spot 11: 3146687174 + spot 7: 24448365 + spot 10: 3015811686 + spot 11: 3146726557 + spot [spot@spot spot]$
3146726557-3146687174=39383 ips 3015811686-3015770449=41237 ips ------------------------------- 80620 ips
CPU Pentium 166 MMX, 32Mb RAM, kernel 2.0.36, MB VIA VPX, 512K cache L2, 66 Mhz bus.
I've tried also with procinfo -D -n1 and there are about 30k interrupts from each source.
bye,
-- Catalin Muresan CM1206-RIPE CODEC Electronic Products voice: +40-64-432450 Internet Services Department email: cata@codec.ro ----------------------------------------------------------------------- 1:33pm up 12 days, 20:35, 10 users, load average: 0.10, 0.16, 0.17
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