Date: Fri, 22 Jan 1999 20:56:07 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "John S. Dyson" <dyson@iquest.net> Cc: hackers@FreeBSD.ORG Subject: Re: Error in vm_fault change Message-ID: <199901230456.UAA58423@apollo.backplane.com> References: <199901220831.DAA00487@y.dyson.net>
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:hoggy process. However, thrashing by a hoggy process should be managed by
:limits. :-(. You are breaking any notion of the pageout daemon keeping stats
:in normal low memory conditions, but thrashing is hopeless anyway without
:limits (am I repeating myself?)
Being realistic, *nobody* manages the RSS limits this tightly. As
much as I like RSS limits, their lack of any sort of dynamic feedback
makes them mostly unuseable in my view. They were almost entirely
unuseable at BEST on every machine from the lowliest mail server to the
most heavily loaded shell/web machine. On early machines with
significantly less memory then the machines have now, all I got for my
efforts were user complaints.
The problem is that by the time an RSS limit kicks in, the damage
has already been done.
If RSS limits were metrics rather then absolute values, they would
be MUCH more useful.
:John | Never try to teach a pig to sing,
:dyson@iquest.net | it makes one look stupid
-Matt
Matthew Dillon
<dillon@backplane.com>
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