Re: usbmon and iso
"Clemens Ladisch" <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Alan Stern wrote: > On Wed, 7 Feb 2007, Pete Zaitcev wrote: > > Alan, do you happen to know how much usb_iso_packet_descriptor thingies > > we allocate typically? One? Three? Tens? A hundred? In usbfs we allow 128. > > If we routinely get lots of them per URB then I need to rethink the line > > format and all other things. It's a big can of worms. > > My experience is not very wide. However I think it would be okay to cap > the number at, say, 16. Probably 99+% of URBs will use fewer than that. > A typical user of Iso URBs is USB audio; maybe Clemens can provide some > guidance. The driver uses 8 packets per URB by default. It is possible to select a higher value with a module option; the maximum value is 20 (but this is just a #define). In high speed mode, everything is multiplied by 8. HTH Clemens ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel