Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: [RFC] block layer support for DMA IOMMU bypass mode II | From | James Bottomley <> | Date | 30 Jul 2003 09:20:52 -0500 |
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On Tue, 2003-07-29 at 23:42, Grant Grundler wrote: > On Mon, Jul 28, 2003 at 01:15:13PM +0200, Andi Kleen wrote: > > Run it with 100-500 users (reaim -f workfile... -s 100 -e 500 -i 100) > > jejb was wondering if 4k pages would cause different behaviors becuase > of file system vs page size (4k vs 16k). ia64 uses 16k by default. > I've rebuilt the kernel with 4k page size and VMERGE != 0. > The substantially worse performance feels like a rat hole because > of 4x pressure on CPU TLB.
OK, I admit it, it was a rat hole. Provided reaim uses large files, we should only get block<->page fragmentation at the edges, and obviously, reaim has to use large files otherwise it's not testing the virtual merging properly...
James
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