Re: root compromise on debian woody
On Fri, May 27, 2005 at 10:43:11AM -0400, Carl Fink wrote:
> On Fri, May 27, 2005 at 07:00:56AM -0400, Sean Davis wrote:
>
> > *: Linux LOVES to swap. I swap all the time on my 1.8ghz Athlon XP with 1GB
> > ram. However, my NetBSD machine with the same amount of ram running at the
> > same frequency NEVER swaps, due to the ability to tune the VM, and the
> > better VM (UVM) in general. The NetBSD server almost always has at least
> > twice if not three times as much going on (+ KDE3.4) than the Linux machine.
> > Yet still never swaps or lags. Wish I could say that for Debian Woody, but I
> > can't.
>
> Linux swaps aggressively, even when unnecessary in the short term on
> purpose, so RAM containing the swapped data or executable is available if a
> new task arises. If the swapped stuff is called for, it's used from RAM and
> no time is lost.
no time is lost... you have infinite-transfer-speed zero-latency drives, or
what? I can't be the only one who's noticed that when machines start
swapping, they start getting slower. Or the only one to connect the two, for
that matter.
If there is enough RAM for the current workload, there is no reason to swap.
Period. Swapping when it's not needed is a ridiculous waste of CPU time and
disk I/O. If I understand your argument correctly, an accurate analogy would
be leaving your car running 24/7 just so that you don't have to start it the
next time you want to drive somewhere. Would you do that? no.
-Sean
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