cvs commit: src/sys/dev/bfe if_bfe.c if_bfereg.h

[Pyun YongHyeon]

On Fri, Aug 22, 2008 at 02:20:27PM -0400, John Baldwin wrote:
 > On Friday 22 August 2008 02:46:55 am Pyun YongHyeon wrote:
 > > yongari     2008-08-22 06:46:55 UTC
 > > 
 > >   FreeBSD src repository
 > > 
 > >   Modified files:
 > >     sys/dev/bfe          if_bfe.c if_bfereg.h 
 > >   Log:
 > >   SVN rev 181994 on 2008-08-22 06:46:55Z by yongari
 > >   
 > >   Add a new sysctl node 'dev.bfe.N.stats' that shows various MAC
 > >   counters for Rx/Tx statistics. Various counters in ifnet is also
 > >   updated with these hardware counters.
 > >   
 > >   Tested by:      kib, Gleb Kurtsou gleb.kurtsou at gmail dot com
 > >                   Ulrich Spoerlein uspoerlein at gmail dot com
 > 
 > I think it's kind of wrong to have sysctl's that print stats in dmesg.  You 
 > can either have a sysctl that returns a string and uses sbuf's (e.g. 
 > vm.phys_free) if you want formatting or even better, you can give each stat 
 > it's own sysctl.  This is more friendly for people to use when they aren't on 
 > the console (e.g. when you ssh into a box).
 > 

I fully agree. Spewing lots of message in dmesg would be wong,
especially on slow serial link. I thought these counters would be
just used to analyze driver bug or odd driver behavior. It was just
for debugging.

For long time I wanted a architectural way to add these kind of
counters in ethernet drivers. Adding a sysctl node for each counter
looked like overkilling at that time and we still don't have a
generic tool to dump the stats. I'll think about it again.

-- 
Regards,
Pyun YongHyeon