Re: use of isochronous mode

2014-05-22 Thread Alan Stern
On Thu, 22 May 2014, Russel Hughes wrote: > > > > Does the Linux USB implementation supports both equally well? And also the > > scheduling of a mixture of both pipe types? For both USB 2 and 3? > > Do you have an idea why many commercial devices (e.g. AV applications) > > still would go for bul

Re: use of isochronous mode

2014-05-22 Thread Alan Stern
On Thu, 22 May 2014, Yves Martens wrote: > Hello, > > I read the USB spec, understand when to prefer bulk vs. isochronous pipes. > My usecase requires controlled jitter & guaranteed bandwidth. > But when discussing this with multiple peer engineers, rumor goes isochronous > mode has 'issues' (s

Re: use of isochronous mode

2014-05-22 Thread Russel Hughes
> > Does the Linux USB implementation supports both equally well? And also the > scheduling of a mixture of both pipe types? For both USB 2 and 3? > Do you have an idea why many commercial devices (e.g. AV applications) still > would go for bulk? > > Thanks a lot & kind regards, > Yves > -- I ha

use of isochronous mode

2014-05-22 Thread Yves Martens
Hello, I read the USB spec, understand when to prefer bulk vs. isochronous pipes. My usecase requires controlled jitter & guaranteed bandwidth. But when discussing this with multiple peer engineers, rumor goes isochronous mode has 'issues' (sic), they advise me against using it altogether. But