Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [PATCH] mm - implement swap prefetching | Date | Tue, 11 Oct 2005 00:39:50 +1000 |
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On Tue, 11 Oct 2005 00:35, Jesper Juhl wrote: > On 10/10/05, Con Kolivas <kernel@kolivas.org> wrote: > > Andrew could you please consider this for -mm > > > > Small changes to the style after suggestions from Pekka Enberg (thanks), > > and changed the default size of prefetch to gently increase with size of > > ram. Functionally this is the same code as vm-swap_prefetch-15 and I > > believe ready for a wider audience. > > + What this will do on workstations is slowly bring back applications > + that have swapped out after memory intensive workloads back into > + physical ram if you have free ram at a later stage and the machine > + is relatively idle. This means that when you come back to your > + computer after leaving it idle for a while, applications will come > + to life faster. Note that your swap usage will appear to increase > + but these are cached pages, can be dropped freely by the vm, and it > + should stabilise around 50% swap usage. > + > + Desktop users will most likely want to say Y. > > How about a little note about the impact for server users as well? > You recommend that desktop users enable this, but you don't give any > recommendation for servers.
Your guess is as good as mine. I can easily demonstrate a benefit when using it with desktop workloads but a server? It's not expensive to run but I don't really know if it's advantageous either. If I had to take a guess, a server that had multiple user logins running applications would benefit, but database, web servers etc I doubt would benefit.
Cheers, Con - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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