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- Path: sparky!uunet!ogicse!usenet.coe.montana.edu!decwrl!deccrl!news.crl.dec.com!pa.dec.com!haddad
- From: haddad@pa.dec.com (Ramsey Haddad)
- Newsgroups: comp.arch
- Subject: Re: Interrupts vs Polling---WAS: cooling
- Message-ID: <1992Aug28.173340.3576@PA.dec.com>
- Date: 28 Aug 92 17:33:40 GMT
- Article-I.D.: PA.1992Aug28.173340.3576
- References: <BtED7C.5II@exnet.co.uk> <BtEy50.Ix4.2@cs.cmu.edu> <BtIDsH.8x3@exnet.co.uk>
- Sender: news@PA.dec.com (News)
- Organization: DEC Western Research Lab, Palo Alto, CA
- Lines: 21
-
- In article <BtIDsH.8x3@exnet.co.uk> dhd@exnet.co.uk (Damon) writes:
- >In article <BtEy50.Ix4.2@cs.cmu.edu> lindsay+@cs.cmu.edu (Donald Lindsay) writes:
- >>Close to the truth. High-reliability systems (and high priced
- >>systems) can justify computer monitoring to detect e.g. a failed fan.
- >>Aha, /dev/muffin! - well, actually, it's more likely an interrupt
- >>flavor. The DECWRL heat pipe requires a vertical-orientation sensor
- >>(and power cutoff).
- >
- >Let's not use interrupts for this sort of thing. Just how quickly is the
- >temperature going to change. A once per second poll should be more than
- >enough. B^>/2.
-
- I checked with the mechanical engineers involved (Hamburgen & Fitch). They
- say that you should have "a few seconds, but not minutes" after tipping to
- perform any shutdown routine. When first tipped, the thermosiphon actually
- works more efficiently at cooling: instead of trying to boil a pool of
- liquid, it will only have to boil a thin film of liquid.
-
- --
- Ramsey Haddad <haddad@decwrl.dec.com>
- speaking for myself.
-