Date: Sat, 4 Nov 2006 22:06:44 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Kip Macy <kip.macy@gmail.com> Cc: current@freebsd.org, sparc64@freebsd.org, John Birrell <jb@what-creek.com>, FreeBSD Tinderbox <tinderbox@freebsd.org> Subject: Re: [head tinderbox] failure on sparc64/sun4v Message-ID: <20061104110644.GE854@turion.vk2pj.dyndns.org> In-Reply-To: <b1fa29170611032346x5803847esad273b1965cbddcd@mail.gmail.com> References: <20061104060421.6145773068@freebsd-current.sentex.ca> <20061104070047.GA98215@what-creek.com> <b1fa29170611032346x5803847esad273b1965cbddcd@mail.gmail.com>
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--VdOwlNaOFKGAtAAV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. --=20 Peter Jeremy --VdOwlNaOFKGAtAAV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFTHRE/opHv/APuIcRAnBYAJ9oW7jVI4smKIV9aaz6RITJWmajZgCfYYgU zD7AhcbuoRUAy9VbvV44qeA= =MAHq -----END PGP SIGNATURE----- --VdOwlNaOFKGAtAAV--
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