Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 8 May 2003 21:26:59 -0700 | From | William Lee Irwin III <> | Subject | Re: how to measure scheduler latency on powerpc? realfeel doesn't work due to /dev/rtc issues |
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On Thu, 8 May 2003, William Lee Irwin III wrote: >>>>> Why would you want to use an interrupt? Just count jiffies in sched.c
On Thu, May 08, 2003 at 11:52:29PM -0400, Chris Friesen wrote: > I'm trying to get a feel for the maximum time from an interrupt coming in > until the userspace handler gets notified. On intel you can program the > hardware to generate interupts through /dev/rtc. The powerpc doesn't seem > to support this. > Jiffies are not accurate enough, I am expecting max latencies in the 1-2 ms > range. > Unfortunately no. USB/Firewire/Ethernet on the desktop, ethernet/serial > for compactPCI. > I want to find an additional programmable interrupt source. It bites that > cheap PCs have this, and the powerpc doesn't.
Try the timebase instead.
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