Messages in this thread | | | From | (Alan Cox) | Subject | Re: Lockup 2.1.6* => kmalloc/slab ??? | Date | Sat, 8 Nov 1997 23:09:13 +0000 (GMT) |
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> > This gives page-colouring (and a few other performance improvements) > > coupled with a weak fragmentation control. I'm calling the control weak, > > as I've out ripped all the heavy control stuff I was doing (well, was > > doing this morning). It will also speed up most CPU/memory intensive > > tasks. > Does this fragmentation control actually defragment if needed? Not being > able to allocate memory while enough free pages are present (though > fragmented) looks as a deficiency to me. What about next points? Forgive me >it these are absolute nonsens or already implented.
On a 32Mbyte box running a fair bit of NFS page colouring causes enough fragmentation that the NFS performance goes to pieces, and on non NFS I can't measure any difference for normal use.
Im sure page colouring makes sense on a box with 512Mb of RAM and with fragmentation control, but not on anything that much smaller. This is also an SMP box with low memory bandwidths - the sort that might gain most
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