Messages in this thread | | | Date | Mon, 10 Oct 2005 14:12:18 -0700 | From | Mark Knecht <> | Subject | Re: Latency data - 2.6.14-rc3-rt13 |
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On 10/10/05, Daniel Walker <dwalker@mvista.com> wrote: > On Mon, 2005-10-10 at 13:16 -0700, Mark Knecht wrote: > > Hi, > > > > > How can I get data that would be more useful in terms of real debug? > > The IRQ off times look like the worst . If you do "make menuconfig" > > then goto Kernel Hacking and select > "Interrupts-off critical section latency timing" > Then select "Latency tracing" > > Then when you boot the system before run the following, > > "echo 0 > /proc/sys/kernel/preempt_max_latency"
So this disables the tracing of preempt times but keeps IRQ times on? Cool. > > > That will record a trace for every maximum latency observed for IRQ > latency . You can view the trace with this command > "cat /proc/latency_trace" , and you can attach the trace to an email to > LKML so we can review it (compress it if it's big though) . > > Daniel
Will do. Building now. I'll be back later.
Is there anything specific I should look for in the traces myself? Anyway to help narrow it down?
Cheers, Mark - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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