On Wed, Sep 30, 2009 at 6:01 AM, Michal Ludvig wrote:
> Peter Teoh wrote:
>> On Wed, Sep 30, 2009 at 11:47 AM, Michal Ludvig wrote:
>>> Hi all,
>>>
>>> I've got a digital IO card hanging off an ISA bus in PC/104 system. I'm
>>> pushing data packets to it, usually 16-32 bytes per transfer, 100x pe
n Wed, Sep 30, 2009 at 3:26 AM, Thomas Petazzoni
wrote:
> Le Wed, 30 Sep 2009 16:47:33 +1300,
> Michal Ludvig a écrit :
>
>> I've got two questions:
>> 1) Can I speed it up somehow?
>> 2) Apparently it's quite a lot of time between calling outb() and its
>> return. Can the kernel do something els
On Wed, Sep 30, 2009 at 3:18 AM, Thomas Petazzoni
wrote:
> Le Wed, 30 Sep 2009 13:50:22 +0800,
> Peter Teoh a écrit :
>
>> generally, port i/o programming is always slower than mmio, why don't
>> u consider that option?
>
> Well, it's rarely an option. Either the device is programmed through
> PI
Peter Teoh wrote:
> On Wed, Sep 30, 2009 at 11:47 AM, Michal Ludvig wrote:
>> Hi all,
>>
>> I've got a digital IO card hanging off an ISA bus in PC/104 system. I'm
>> pushing data packets to it, usually 16-32 bytes per transfer, 100x per
>> second.
>>
>> Apparently ISA bus clock is supposed to run
Le Wed, 30 Sep 2009 16:47:33 +1300,
Michal Ludvig a écrit :
> I've got two questions:
> 1) Can I speed it up somehow?
> 2) Apparently it's quite a lot of time between calling outb() and its
> return. Can the kernel do something else in the meantime, like
> scheduling another process or handling i
Le Wed, 30 Sep 2009 13:50:22 +0800,
Peter Teoh a écrit :
> generally, port i/o programming is always slower than mmio, why don't
> u consider that option?
Well, it's rarely an option. Either the device is programmed through
PIO *or* through MMIO. And I suspect that most ISA devices can only be
p
On Wed, Sep 30, 2009 at 11:47 AM, Michal Ludvig wrote:
> Hi all,
>
> I've got a digital IO card hanging off an ISA bus in PC/104 system. I'm
> pushing data packets to it, usually 16-32 bytes per transfer, 100x per
> second.
>
> Apparently ISA bus clock is supposed to run at 8MHz and I expected to
Hi all,
I've got a digital IO card hanging off an ISA bus in PC/104 system. I'm
pushing data packets to it, usually 16-32 bytes per transfer, 100x per
second.
Apparently ISA bus clock is supposed to run at 8MHz and I expected to
achieve somewhat close-to-that performance with my driver. To test t
