Thanks Michal !
Regards,
Shivdas Gujare
2010/7/14 Michał Nazarewicz <m.nazarewicz@xxxxxxxxxxx>:
> On Tue, 13 Jul 2010 16:33:02 +0200, Shivdas Gujare <shivdas.tech@xxxxxxxxx>
> wrote:
>
>> Hi,
>>
>> Is there any factor which decides "how may requests should be
>> allocated for certain endpoint?"
>> for. ex, most of gadget driver's have a kind of for loop like
>>
>> for (i=0; i < number_of_requests; i ++) {
>> usb_ep_alloc_request(ep, GFP_ATOMIC);
>> }
>>
>> so, which factor decides what should be the value of
>> "number_of_requests" in above for loop, if we want to write a new
>> gadget driver?
>> Thanks for the help.
>
> More buffers allow for double-or-more buffering. If you are writing a new
> driver just stick to one request. If things starts working try to add more
> requests for better buffering. How many exactly, I'm probably not the best
> person to answer but I'd say as many as it'll take to keep the hardware busy
> all the time. This is pretty protocol and gadget dependent.
>
> --
> Best regards, _ _
> | Humble Liege of Serenely Enlightened Majesty of o' \,=./ `o
> | Computer Science, Michał "mina86" Nazarewicz (o o)
> +----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--
>
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