Messages in this thread | | | Date | Fri, 19 Nov 1999 23:34:02 +0100 | From | Roger Larsson <> | Subject | latency-profiling (Was: Re: Linux 2.2.14pre6) |
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Hi,
I developed a instrumentation patch to catch code that run in kernel for a long time (> 5 ms). It is really written for 2.2.13 but it should be easily adaptable to any kernel.
More info at: http://www.norran.net/nra02596/
It needs another higher priority thread wanting to run you can use Bennos latency test.
http://www.gardena.net/benno/linux/audio/ [current at http://www.gardena.net/benno/linux/latencytest-0.42.tar.gz ]
/RogerL
Rogier Wolff wrote: > > Alan Cox wrote: > > > For some reason I get serial overrun errors with 2.2.14pre6: > > > Does backing out the mdelay(1) added to the pc keyboard driver fix > > this. If so I'll pull that change until someone has time to redo it > > to avoid irq problems > > The 2.2 IDE driver disables interrupts for up to around 20ms. I > suspect that this depends on the drive. i.e. it sometimes waits inside > the IRQ for the drive to do its thing instead of waiting for the next > interrupt. This is probably a problem in the drive, that we simply > used to handle a lot better before.... > > Roger. > > -- > ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** > *-- BitWizard writes Linux device drivers for any device you may have! --* > "I didn't say it was your fault. I said I was going to blame it on you." > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/
--
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Roger Larsson Skellefteå Sweden
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