Date: Mon, 6 Nov 2006 16:49:55 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-sparc64@freebsd.org Cc: current@freebsd.org, Peter Jeremy <peterjeremy@optushome.com.au>, Kip Macy <kip.macy@gmail.com>, FreeBSD Tinderbox <tinderbox@freebsd.org>, sparc64@freebsd.org, John Birrell <jb@what-creek.com> Subject: Re: [head tinderbox] failure on sparc64/sun4v Message-ID: <200611061649.56193.jhb@freebsd.org> In-Reply-To: <20061104110644.GE854@turion.vk2pj.dyndns.org> References: <20061104060421.6145773068@freebsd-current.sentex.ca> <b1fa29170611032346x5803847esad273b1965cbddcd@mail.gmail.com> <20061104110644.GE854@turion.vk2pj.dyndns.org>
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On Saturday 04 November 2006 06:06, Peter Jeremy wrote: > On Fri, 2006-Nov-03 23:46:27 -0800, Kip Macy wrote: > >Sparc64 only supports CAS on 4 and 8 byte quantities. The only > >operation it support on 16 bytes is load. > > The '16' in 'atomic_add_16' is bits. Few RISC architectures can > support atomic operations (or primitives to build atomic ops) on > anything other than their native word side and 32 bits. > > The problem is that SCTP is using a 16-bit refcnt and trying to > manipulate it atomically. This is problematic on anything except i386 > and amd64. The easiest solution seems to be to change refcnt to an > [u]int - though I'm not sure what other impacts this may have. And if possible it should just use 'refcount_*()' instead of 'atomic_*()' directly. -- John Baldwin
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