Messages in this thread | | | Date | Fri, 24 Mar 2006 09:16:07 +0100 | From | Helge Hafting <> | Subject | Re: swap prefetching merge plans |
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Hemmann, Volker Armin wrote:
>On Thursday 23 March 2006 12:47, you wrote: > > >>On Thursday 23 March 2006 10:26, Nick Piggin wrote: >> >> >>>Hemmann, Volker Armin wrote: >>> >>> >>>>Hi, >>>> >>>>I am just a user, but I would love to see this feature. >>>> >>>>After compiling stuff, I have usually some kb in swap (300kb, 360 kb), >>>>and lots of free ram. But even this few kb make my KDE desktop extremly >>>>sluggish. It feels, like every byte is fetched individually and always >>>>the wrong stuff ends in swap. >>>> >>>> >>>I'm almost positive this wouldn't be the cause of your problems (even a >>>slow disk could read all these blocks in, randomly, in under 2 seconds, >>>assuming they're spread from one end of the platters to the other). >>> >>> >>Maybe he meant 300 megabytes. >> >> > >no, I meant kilobytes. > >And swapoff really helps. > >Some moments of disk activity, and bang, computer is as fast as always again. > >But having stuff in swap? konqueror is slow, kmail is slow, opening a konsole >session, slow. Everything crawls with lots of disk access. > >next time the computer is slow, I could gather some data - if you tell me, >what is interessting for you, I'll save it. > > Strange indeed. 300k in swap is nothing - I often enough have 50M in swap without a slowdown - but then, I don't run kde.
Be aware that the 300k in swap doesn't account for all that is removed from memory. Linux don't put executable code in swap - such stuff is simply dropped because it can be reloaded from the executable files anytime. I don't think swapoff+swapon helps with that though.
Helge Hafting
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