Messages in this thread |  | | Date | Fri, 18 May 2001 23:12:32 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: Linux 2.4.4-ac10 |
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On Fri, 18 May 2001, Stephen C. Tweedie wrote: > On Fri, May 18, 2001 at 07:44:39PM -0300, Rik van Riel wrote: > > > This is the core of why we cannot (IMHO) have a discussion > > of whether a patch introducing new VM tunables can go in: > > there is no clear overview of exactly what would need to be > > tunable and how it would help. > > It's worse than that. The workload on most typical systems is not > static. The VM *must* be able to cope with dynamic workloads. You > might twiddle all the knobs on your system to make your database run > faster, but end up in such a situation that the next time a mail flood > arrives for sendmail, the whole box locks up because the VM can no > longer adapt.
That's another problem, indeed ;)
Ingo, Mike, please keep this in mind when designing tunables or deciding which test you want to run today in order to look how the VM is performing.
Basic rule for VM: once you start swapping, you cannot win; All you can do is make sure no situation loses really badly and most situations perform reasonably.
Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose...
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