CVS commit: src/sys/dev/usb

["Jonathan A. Kollasch" <jakllsch%netbsd.org@localhost>]

Module Name:    src
Committed By:   jakllsch
Date:           Tue Jul 27 20:20:46 UTC 2010

Modified Files:
        src/sys/dev/usb: ugen.c

Log Message:
Tune ugen(4) isochronous parameters to better support high speed pipes.

Fixes PR#43159.

Justification:

UGEN_NISORFRMS, previously 4, is now 8 because that's the number of
microframes per frame on a high speed bus.  This allows data to be
transfered every microframe if necessary.

UGEN_NISOREQS, previously 6, is now 4.  This is harder to justify,
but I didn't think the total number of buffer frames needed to be
much more than it was.

UGEN_NISOFRAMES, previously 500, is now (UGEN_NISORFRMS * UGEN_NISOREQS)
(32 with values as above).  This is all the more we've actually used.


To generate a diff of this commit:
cvs rdiff -u -r1.109 -r1.110 src/sys/dev/usb/ugen.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.