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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Interrupts in Linux |
| From: | Till Straumann via Tech-talk <tech-talk at aps.anl.gov> |
| To: | "Siddons, David" <siddons at bnl.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov> |
| Date: | Mon, 5 Apr 2021 14:58:43 +0200 |
Hi Pete.
FWIW - I have regularly used linux (currently 4.14.139 with RT_PREEMPT but a few other versions, too, over the years)
on the zynq with fabric-generated interrupts. Never experienced anything matching your description.
From the scarce information it is difficult to draw conclusions...
Best
- Till
On 4/5/21 2:49 PM, Siddons, David via Tech-talk wrote:
FWIW - I have regularly used linux (currently 4.14.139 with RT_PREEMPT but a few other versions, too, over the years)
on the zynq with fabric-generated interrupts. Never experienced anything matching your description.
From the scarce information it is difficult to draw conclusions...
Best
- Till
On 4/5/21 2:49 PM, Siddons, David via Tech-talk wrote:
I have an embedded Linux system based on the ZynQ processor. I have the FPGA configured to generate a hardware interrupt whenever data is ready to be read. The frequency of the interrupts depends on the integration time of the measurement, and should be settable from seconds to around one millisecond. This is all within an EPICS IOC running under ARM Linux, in a Debian 10 system. What I observe is that the maximum frequency I can use is 100Hz, which is the Linux system clock tick frequency. Presumably there is a lock somewhere inhibiting interrupts except at tick time. I tried rebuilding the kernel with the PREEMPT-RT patch enabled, but it seems not to make a difference. I am definitely not a kernel expert; does anyone know what I'm missing?Thanks,Pete.
- References:
- Interrupts in Linux Siddons, David via Tech-talk
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