Re: [linux-usb-devel] question on ehci's memory needs

2007-06-29 Thread Oliver Neukum
Am Freitag, 29. Juni 2007 schrieb David Brownell: > On Friday 29 June 2007, Oliver Neukum wrote: > > Hi, > > > > I am trying to calculate worst cases memory requirements of EHCI. > > For bulk transfers it seems to me that you need size/16384 (rounded up) > > qtd and one qh. Is it really that easy?

Re: [linux-usb-devel] question on ehci's memory needs

2007-06-29 Thread David Brownell
On Friday 29 June 2007, Oliver Neukum wrote: > Hi, > > I am trying to calculate worst cases memory requirements of EHCI. > For bulk transfers it seems to me that you need size/16384 (rounded up) > qtd and one qh. Is it really that easy? ISTR, yes. And interrupt transfers are the same. > What ab

[linux-usb-devel] question on ehci's memory needs

2007-06-29 Thread Oliver Neukum
Hi, I am trying to calculate worst cases memory requirements of EHCI. For bulk transfers it seems to me that you need size/16384 (rounded up) qtd and one qh. Is it really that easy? What about the other transfer types? TIA Oliver -