[HEADSUP] Please help test device vnode bypass!

[Conrad J. Sabatier]

On Wed, 10 Nov 2004 17:54:07 +0100, Sebastian Schulze Struchtrup
<seb at struchtrup.com> wrote:

> Poul-Henning Kamp wrote:
> 
> >Please test this feature.
> >
> >Even better, help test the perforce branch phk_bufwork if you can.
> >
> >Poul-Henning
> >
> >In message <200411081046.iA8AklqT003808 at repoman.freebsd.org>,
> >Poul-Henning Kamp
> > writes:
> >  
> >
> >>phk         2004-11-08 10:46:47 UTC
> >>
> >> FreeBSD src repository
> >>
> >> Modified files:
> >>   sys/fs/devfs         devfs_vnops.c 
> >> Log:
> >> Add optional device vnode bypass to DEVFS.
> >>
> >>    
> >>
> 
> fops=0
> 1000000 bytes transferred in 4.865386 secs (205534 bytes/sec)
> 
> fops=1
> 1000000 bytes transferred in 2.513814 secs (397802 bytes/sec)
> 
> This would result in approx. 2us per syscall.
> 
> System is FreeBSD 6.0-CURRENT #25: Tue Nov  9 13:44:16 CET 2004  
> (something like an Athlon XP 2k) with invariants and witness, without 
> anything out of phk_bufwork.
> 
> No problems until now.

No problems here, either (except that natd now mysteriously panics on
boot; probably unrelated?).

I've noticed a *very* substantial speedup in fscking my ~170 gig /usr
partition.  Very nice!

-- 
Conrad J. Sabatier <conrads at cox.net> -- "In Unix veritas"