Date: Sat, 04 Nov 2006 06:29:55 -0500 From: Randall Stewart <rrs@cisco.com> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: FreeBSD Tinderbox <tinderbox@freebsd.org>, John Birrell <jb@what-creek.com>, current@freebsd.org, sparc64@freebsd.org Subject: Re: [head tinderbox] failure on sparc64/sun4v Message-ID: <454C79B3.9080609@cisco.com> In-Reply-To: <20061104110644.GE854@turion.vk2pj.dyndns.org> References: <20061104060421.6145773068@freebsd-current.sentex.ca> <20061104070047.GA98215@what-creek.com> <b1fa29170611032346x5803847esad273b1965cbddcd@mail.gmail.com> <20061104110644.GE854@turion.vk2pj.dyndns.org>
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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. > Ahh... cool.. I have been wondering if I should not just waste a few more bytes and move all 16 bit counts that we play with atomically to 32 bit.. I will do so.. it will make life easier for all concerned :-) R -- Randall Stewart NSSTG - Cisco Systems Inc. 803-345-0369 <or> 803-317-4952 (cell)
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