Re: New USB stack on FreeBSD w/Linux emulation layer coming
Oliver Neukum <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Am Mittwoch, 16. Mai 2007 19:33 schrieb Alan Stern: > > All devices need to allocate some memory, even if they are not used. That is > > just the way it is. If you want to save memory, then USB has the advantage > > that you can unplug the device and save resources. > > Of course all devices need memory. But there's a big difference > between preallocating 4 KB and preallocating 512 KB. And if you start > telling people they can save memory by unplugging their USB devices, > they'll just laugh at you. Saving memory is the OS's job, not the > user's. If this is the problem do the allocation in usb_alloc_urb(). This way a driver can choose to use preallocation by reusing URBs or not reusing them. In any case allocating a single data structure is faster than at a minimum two data structures. Regards Oliver ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel