Hi Marc,
The maximum transfer size (AFAIK) same as maximum packet size of the end
point descriptors(Correct me if I am wrong). But this is not the limit I
am encountering, if I submit an URB with data greater than 4k then the
request is failed by lower driver. This has nothing to do with packet
size from the descriptor.
As of now I am splitting the request into 1k chunks and I feel that is
safe too.
Thanks/Regards,
Shashi
-----Original Message-----
From: Marc Reinig [mailto:xxxxx@nowwhere.com]
Sent: Friday, October 04, 2002 9:42 PM
To: NT Developers Interest List
Subject: [ntdev] Re: [ntdev]:To change page sizeMaximumTransferSize is used to specify the maximum transfer request
size
for
pipe. It defaults to 4096. It can be changed and is not directly
related
to page size.Search for MaximumTransferSize in the DDK to see how to change it.
Why do you want to circumvent this behavior? Very little benefit will
be
gained if any, and if the size is increased by a large amount, the
performance of other devices on the USB may suffer. Just divide up
your
desired size into blocks of MaximumTransferSize and feed them to the
USB.Marc Reinig
System Solutions> This was to verify the behavior of the USB host control driver
> which does not allow read/write above 4096K per URB. I suspected
> this to be dependent on the page size and if it is so what is
> the reason behind it. And is there anyway to override or
> circumvent this behavior of USBHCD.sys
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