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List:       netbsd-tech-kern
Subject:    Re: NFS lockup after UDP fragments getting lost (was: 8.1 tstile lockup after nfs send error 51)
From:       maya () NetBSD ! org
Date:       2019-07-31 19:17:18
Message-ID: 20190731191718.GA20997 () homeworld ! netbsd ! org
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On Wed, Jul 31, 2019 at 07:11:54AM -0700, Jason Thorpe wrote:
> 
> > On Jul 31, 2019, at 1:45 AM, Edgar Fuß <ef@math.uni-bonn.de> wrote:
> > 
> > NetBSD design error (or so Taylor says) that a vnode lock may be held accross I/O
> 
> 100%
> 
> NetBSD's VFS locking protocol needs a serious overhaul.  At least one other \
> BSD-family VFS (the one in XNU) completely eliminated locking of vnodes at the VFS \
> layer (it's all pushed into the file system back-ends who now have more control \
> over their own locking requirements).  It does have some additional complexities \
> around reference / busy counting and vnode identity, but it works very well in \
> practice. 
> I don't know what FreeBSD has done in this area.
> 
> -- thorpej
> 

IMNT_MPSAFE, which NFS isn't?


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