From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <43B2A325.1080409@lanl.gov> Date: Wed, 28 Dec 2005 07:37:25 -0700 From: Ronald G Minnich User-Agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929) MIME-Version: 1.0 Cc: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu> Subject: Re: [9fans] Re: Announcing the release of NetBSD 3.0 References: <20051223180437.GA2661@colwyn.zhadum.org.uk> <764a7c7c4f28a737bd9f464a0fa3315c@proxima.alt.za> <20051224101134.GA30220@server4.lensbuddy.com> <20051225125407.GD30220@server4.lensbuddy.com> <20051225201654.221ED508@dexter-peak.quanstro.net> <26821.128.165.0.81.1135645921.squirrel@webmail.lanl.gov> <20051227013600.C3A2D1B1D6D@dexter-peak.quanstro.net> In-Reply-To: <20051227013600.C3A2D1B1D6D@dexter-peak.quanstro.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Topicbox-Message-UUID: cb448370-ead0-11e9-9d60-3106f5b1d025 erik quanstrom wrote: > i was interested in one posting (i'm to lazy to re reread it and find the > reference) where you were multicasting or broadcasting a buffer to > n nodes for digestion using what sounded like page-based DSM. available in ZOUNDS. ZOUNDS was more like an "attach this chunk of your virtual memory to this network connection endpoint" than a real DSM. I never did coherency protocols anyway -- MESI on an ethernet? You gotta be kidding ... Anyways, ZOUNDS used IP multicast for this stuff, and we have found out that many switches choke and die on IP multicast, even today. A nice theory, killed by a brutal gang of facts. > deep in the system that you couldn't mix processor types in a cluster. > (who's to say what node you might have landed on.) > the encoding cluster I mentioned was pentium/freebsd and alpha/linux (64-bit). You can do this stuff, you just have to be careful. ron