Re: 25 microseconds?

From: "Pavel A." <pavel_a@xxxxxxxxxxxxxxx>
Date: Wed, 6 Apr 2005 02:08:08 +0300

There shouldn't be any slow bus devices on LH...
--PA

"Richard Lee" <richard.lee@xxxxxxxx> wrote in message news:1112708718.206293.134990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Good news, Longhorn will go after rogue drivers:
>
> GENDev-5 An ISR does not run longer than 25 microseconds
> GENDev-6 A DPC does not run longer than 100 microseconds
> Revision Draft 0.50 of Windows Logo Program System and
> Device Requirements, Version 3.0
> http://www.microsoft.com/whdc/winlogo/hwrequirements.mspx
>
> But 25 microseconds?
> On the ISA (LPC) bus, I need 1.2 microseconds just
> to read a single register. I was hoping for:
> ISR - 100 microseconds
> DPC - 500 microseconds
>
> I'm not the only one on a slow bus. Am I?
>

.

Follow-Ups:
- Re: 25 microseconds?
  - From: JimE

References:
- 25 microseconds?
  - From: Richard Lee

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Relevant Pages

Re: 25 microseconds?
... There shouldn't be any slow bus devices on LH... ... GENDev-5 An ISR does not run longer than 25 microseconds ... GENDev-6 A DPC does not run longer than 100 microseconds ...
(microsoft.public.development.device.drivers)
25 microseconds?
... GENDev-5 An ISR does not run longer than 25 microseconds ... GENDev-6 A DPC does not run longer than 100 microseconds ...
(microsoft.public.development.device.drivers)
Re: 25 microseconds?
... GENDev-5 An ISR does not run longer than 25 microseconds ... GENDev-6 A DPC does not run longer than 100 microseconds ... I'm not the only one on a slow bus. ...
(microsoft.public.development.device.drivers)
Re: 25 microseconds?
... latencies are typically in range of a small number of microseconds. ... a hard time seeing how draining the FIFO in a DPC would reduce throughput ... Instead of giving my opinions about what you should do in an ISR, ... the ISR typically runs between 50 to 55 microseconds. ...
(microsoft.public.development.device.drivers)
Re: 25 microseconds?
... Draining the serial FIFO in the ISR is by better ... than sipping one character at a time since each character in the FIFO is ... ISR - 10 microseconds ...
(microsoft.public.development.device.drivers)