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.
Matt
--
Matthew Dharm Home: [EMAIL PROTECTED]
Maintainer, Linux USB Mass Storage Driver
I want my GPFs!!!
-- Stef
User Friendly, 11/9/1998
pgphApX1ILhNk.pgp
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