On Thu, 2 Dec 2004, Xu Levis-Q16136 wrote:
> Got it! Thanks~
> Another problem: Do i need free all of the urbs which i have built before in
> my diconnect function? Now i just free one urb in my func.
> For example:
>
> struct urb *myurb;
> my_prob()
> {...
> for(i=0; i<5; i++)
>
Got it! Thanks~
Another problem: Do i need free all of the urbs which i have built before in my
diconnect function? Now i just free one urb in my func.
For example:
struct urb *myurb;
my_prob()
{...
for(i=0; i<5; i++)
{
myurb = usb_alloc_urb(0);
gards,
Levis
-Original Message-
From: David Brownell [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 02, 2004 12:04 AM
To: Xu Levis-Q16136
Subject: Re: [linux-usb-devel] RE: An usb host transfer speed issue, could
anybodies help me or give me some advice?
On Tuesday 30 November 2004
On Wed, 1 Dec 2004, Xu Levis-Q16136 wrote:
> Alan/Anybodies,
> Now I build 10 URB(IN) and sent them in my prob function, then sent the
> remaining URBs from the completion callback. The transfer speed is about
> 650K bytes/second, good speed. Another issue, do you think this way is
> suit for BULK
Alan/Anybodies,
Now I build 10 URB(IN) and sent them in my prob function, then sent the
remaining URBs from the completion callback. The transfer speed is about 650K
bytes/second, good speed.
Another issue, do you think this way is suit for BULK_OUT transfer? The test
result is same as before wh
Alan,
Great news!
I build 3 urbs(IN) and sent them in my prob function, and sent the remaining
URBs from the completion callback.
The transfer speed improve 3 times. Thanks for your great help!
Next step, i will try build 5 URB(IN) and 3 URB(OUT) to improve the transfer
speed.
Regards,
Levis
-
On Mon, 29 Nov 2004, Xu Levis-Q16136 wrote:
> Alan,
> Sorry for my later reply mail. I'm busying for another usb client
> driver issue. Now i will be focus on this usb host transfer issue. And
> just like you mentioned i should send 3 urbs in prob function, do i need
> to build 3 urbs by using FIL
Alan,
Sorry for my later reply mail. I'm busying for another usb client driver issue.
Now i will be focus on this usb host transfer issue. And just like you
mentioned i should send 3 urbs in prob function, do i need to build 3 urbs by
using FILL_BULK_URB function? If yes, 3 complete_callback_fun
>>No. Send the first 3 URBs from the probe function. Don't wait for them
>>to complete, just send them all immediately. Then send the remaining URBs
>>from the completion callback.
OK, i will try it.
>>I didn't realize you were using 2.4.x. You may have to set the
>>URB_QUEUE_BULK flag in or
On Fri, 12 Nov 2004, Xu Levis-Q16136 wrote:
> Alan,
> Thanks for your great help!
> I used Linux_2.4.20, usb OHC(Intel XScale PX27x), USB1.1 full speed. The
> device is my cell phone(Intel XScale PX255).
>
> For Bulk_IN transfer model, we can send the first IN_URB from prob func.
> just like my c
Alan,
Thanks for your great help!
I used Linux_2.4.20, usb OHC(Intel XScale PX27x), USB1.1 full speed. The device
is my cell phone(Intel XScale PX255).
For Bulk_IN transfer model, we can send the first IN_URB from prob func. just
like my codes. And then we can send the next IN_URB in the complet
On Thu, 11 Nov 2004, Xu Levis-Q16136 wrote:
> Dear all,
> I have written a simple bulkusb driver to test the usb transfer speed. Just
> transfer 256bytes*1000 between host and client. The test result is following:
> transfer data transfer speed
> host--->client 256by
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