Am 18.09.2010 22:19, schrieb Alex Schuster: [...] > > I used to restart kdm once per day in order to free memory. If I did not > do this, KDE4 became nearly unsusabe. > Yeah, logout - logon seems to resolve my problem temporarily, as well.
> > Now this looks different here. I have X with 946M, plasma-desktop with > 505M, that's 15 times the memory you need. Then comes java with 371M (for > TV-Browser - yes, 371MB just for showing the TV programme!), emerge wants > 272M while emerging openoffice. Chromium also needs much memory, my 33 > tabs want 762M: Wow, especially X's usage makes me wonder whether this is a kernel bug. > > Which is another problem I think. One question is how KDE4 can need such a > lot of memory, the other is how the system can become so unresponsive once > its starts swapping. I used to have larger swap with less RAM, and did not > have those performance problems. One year ago I usually had 2G tmpfs for > /var/tmp/portage, nowadays (with 4G) I cannot emerge things while working > with the system (like, watching videos with mplayer). It feels like as > soon as RAM is not enough and swapping occurs, the system swaps stuff that > it will need again immediately. Hmm, maybe it is the usage pattern that matters. I guess X (or whatever gets swapped out in your case) wants to access all the data, maybe for a cyclic refresh or something, it blocks for some time. That's the good thing about normal memory leaks: Whatever is leaked, it is normally not accessed again, anyway. > > The system is an AMD Athlon 4850e (2 cores, 2500MHz) with 4GB of RAM. > Everything is on LVM, most partitions are LUKS-encrypted. /var/tmp/portage > is unencrypted, and at the moment swap is also not encrypted and on my 2nd > drive. The encryption does not be much of an overhead, when the system > stutters, top shows a large wa(it) value, and not much CPU usage. swappiness > is set to 10. > My system is nearly completely on LUKS and LVM. That doesn't seem to be the problym in my case, either. > Any ideas? I might just get another 2G, and then the problems will be gone, > but I think this would be only a workaround. 6G should be enough already > even when using lots of applications, shouldn't it`? > > BTW, I emerged and tried KDE 3.5 a week ago. Cool, things were fast > there. Probably because it needs less memory. But I don't want to go back. > The interesting thing is that I have a netbook with a minimal KDE-4 on it. It doesn't need more than 150M of its 512M memory. Of course it doesn't have Semantic Desktop and all that but it still works good and is responsive as hell.
