Am Donnerstag, 5. Juli 2007 schrieb Matthew Dharm:
> On Mon, Jul 02, 2007 at 09:15:03AM +0200, Oliver Neukum wrote:
> > Am Montag, 2. Juli 2007 schrieb Alan Stern:
> > > If you look at usbmon logs of real usb-storage data transfers you'll
> > > see that multi-page sg elements occur quite frequently. (Of course,
> > > that doesn't prevent us from transferring only one page per URB.)
> >
> > OK, but the storage driver allocates the URBs on the fly. If we change
> > that to preallocation we need to have enough URBs for the worst case.
>
> Of course, in the storage case we control the worst-case. By adjusting the
> parameter which controls how long a sg list the SCSI core will send us, we
> can effectively limit the worst-case number of URBs needed.
Yes, we can.
1. How high is the price?
2. Is it worth it?
3. Isn't a version using one backup URB better?
Regards
Oliver
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