cvs commit: src/sys/dev/usb if_axe.c if_axereg.h

Sam Leffler sam at
Sat Nov 10 10:45:30 PST 2007

Sam Leffler wrote:
> sam         2007-11-10 16:23:38 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/dev/usb          if_axe.c if_axereg.h 
>   Log:
>   Add private tx/rx buffer management to support large frame sizes
>   and update the rx code to handle multiple frames in a single usb
>   transfer.  AX772 parts (at least) exhibit many input errors when
>   operated with a 2K rx buffer and no errors w/ a 4K rx buffer (it's
>   unclear what the cause of the errors is for 2K so this may just be
>   covering up the real issue).  Larger rx buffer sizes show no
>   significant performance improvement for AX772.  Bypassing the common
>   buffer management routines also eliminates an extra context switch
>   on every packet which noticeably improves performance (TCP netperf
>   rx goes from 45 Mb/s to 85 MB/s).
>   Submitted by:   "J.R. Oldroyd" <fbsd at>
>   Reviewed by:    imp
>   Obtained from:  openbsd (partly)
>   MFC after:      3 weeks

Anyone w/ AX88172 parts please test--these changes should be a noop but 
I'd like confirmation before MFC.


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