> From: aldana > Sent: Thursday, July 27, 2006 7:15 AM > Subject: cygwin copy problems usb 2.0 > > > hi, > > i've got usb 2.0, when i copy through TotalCommander the copy > speed is quite high.
I have no idea what a TotalCommander is, but from the context here I assume it's a native Windows app that has copying abilities which are highly optimized for speed. > when i copy through cygwin shell it > seems that it is transmitting data only with usb 1.x speed. > very spooky, because i thought that cygwin is calling windows > drivers/api so it should be indirectly supporting usb2.0 ? > I can assure you with 99.44% confidence that Cygwin is not somehow downgrading your USB connections from 2.0 to 1.x. Such decisions get made at a much much lower level than user-mode apps operate at. In fact, I doubt it's even possible for this to happen in kernel-mode code - I think this all happens at the hub/device hardware/SIE level. Cygwin's cp is slower than a native copy, from anywhere to anywhere else, for a number of reasons. The main one, last I looked (admittedly years ago), was a fallout of portability. Cp opens file and copies them an (f)read/(f)write buffer at a time, while your Windows native program almost certainly simply calls CopyFile() (a Win32 API), bypassing a ton of library code. -- Gary R. Van Sickle -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
