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On Thu, Mar 02, 2006 at 05:03:26PM +0100, Ren? Rebe wrote: > Hi, > > On Wednesday 01 March 2006 22:54, Greg KH wrote: > > > > > Why not just send down 2 urbs with that size then, that would keep the > > > > pipe quite full. > > > > > > Because that requires even more modifications to libusb and sane (i_usb) ... > > > > No, do it in your application I mean. > > Ok, tweaking libusb to queue N URBs for reads to be split (resulting in 9 URBs > in my usecase) I see a nearly 100% improvement here (2 times faster). > > How many URBs may I queue? Nearly infinite (in my case that would be max 64) > or is there some tiny static list somewhere in the affected code-path? There is no static list that I know of, as it is all just pointers. Just don't DOS the kernel by sending it an infinate ammount of memory :) More details can be found on the linux-usb-devel list if you ask there. thanks, greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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