William L. Maltby wrote:
I can't resist. Read the thread that was pointed to on lkml. ROTFLMAO.
*Real* UNIX addressed these problems long ago. I guess the "Gurus"
suffer from NIH (Not Invented Here) syndrome.
Given a "general purpose" system, tunability is a must. UNIX, as
delivered by USL in such examples as Sys V, had tunables that let admins
tune to their needs. A single "swappiness" value is woefully inadequate.
Among the tunables were how much memory for cache, how much for buffers,
how much for X/Y/Z, high and low water marks for all sorts of memory
related stuff and a very valuable attribute bit for executables called
the "sticky bit". It is not the "sticky bit" as used now. It said lock
this app in memory and never swap it. A variation on that (couldn't keep
original semantics with the size of apps these days) would address some
of the "responsiveness" issues raised by some. Some admin tunables would
address the other issues.
The "Gurus" need to learn something my father taught me. "A smart man
learns from his mistakes. A wise man learns from the mistakes of
others". I'm really smart. :-( And, apparently, so are the "Gurus". To
think they have VM this long and no one has thought to swipe these good
ideas from real UNIX. And they're still argueing about all that as if it
has never been hashed out and addressed before.
When I started out in UNIX, it was Interactive 1.3, if I remember, and
it was a dog. Coming from a DOS world, I guess I was overwhelmed by all
the things that could be tuned in the kernel. I probably didn't learn
much about them then, and still don't know a lot about it, but unless
you actively try some of the suggestions and see how things work or
behave, then I guess you still don't know. There seems to have been
some built in tradeoffs over the course of the years in the unix-like
OS's, but it's still seems to work the same. I wonder how well
Interactive 3.4 would stack up to today's versions of CentOS, all the
*BSD's and such.
--
Sam W.Drinkard -- sam@xxxxxxxxxx
http://wa4phy.net
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