netdev - RE: [PATCH RFC 1/1] usb: Tell xhci when usb data might be misaligned

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D0F6B553D@AcuExch.aculab.com>
Date:	Thu, 30 Jan 2014 16:30:30 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Peter Stuge' <peter@...ge.se>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Miller <davem@...emloft.net>
Subject: RE: [PATCH RFC 1/1] usb: Tell xhci when usb data might be	misaligned

From: Peter Stuge 
...
> > code using libusb can generate arbitrarily long transfers that usually
> > get split into 8k fragments.
> 
> libusb splits transfers into 16k urbs, or doesn't with newer code
> when both kernel and libusb support scatter-gather.
> 
> > In fact libusb always uses 8k fragments.
> 
> Hm? Worst-case libusb-1.0 submits 16k urbs. libusb-0.1 I'm unsure
> about, but could check.
...
> Where's the 8k coming from?

My memory, I meant 16k :-(

	David



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