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Re: Lower-latency kernels?



Christian Jaeger writes:

> I'm quite a bit tired of all those 20-second-or-so almost-freeze 
> times when untarring a big file, filtering a bunch of mails in Eudora 
> under MOL, etcetc, just because the kernel 2.4.18 virtual memory 
> infrastructure is paging, sorting and freeing memory or whatever and 
> meanwhile also blocking processes from running that aren't involved 
> in the memory stuff (and hey, I'm having 256MB, so it's not so little 
> ok?). I'm even suspecting that the X crashes I'm having at least 
> every few weeks could be related to this, i.e. some time sensitive 
> operation in the X server gets stuck because of the kernel slowness 
> and makes X crash (because of some bug that would be hidden 
> otherwise).
>
> So my question:
>
> What are your experiences on PPC with the various lowlatency, 

in the 2.5.xx kernel

> preemption and maybe also O(1)scheduler patches?

in the 2.5.xx kernel

> Which ones are working, or crashing, and which is the best for my situation?

Rik van Riel's rmap patches might help you greatly.


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