Messages in this thread | | | Date | Wed, 30 May 2001 11:55:38 +0200 | From | Jens Axboe <> | Subject | Re: [patch] 4GB I/O, cut three |
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On Wed, May 30 2001, Mark Hemment wrote: > Hi Jens, > > I ran this (well, cut-two) on a 4-way box with 4GB of memory and a > modified qlogic fibre channel driver with 32disks hanging off it, without > any problems. The test used was SpecFS 2.0
Cool, could you send me the qlogic diff? It's the one-liner can_dma32 chance I'm interested in, I'm just not sure what driver you used :-) I'll add that to the patch then. Basically all the PCI cards should work, I'm just being cautious and only enabling highmem I/O to the ones that have been tested.
> Peformance is definitely up - but I can't give an exact number, as the > run with this patch was compiled with no-omit-frame-pointer for debugging > any probs.
Good
> I did change the patch so that bounce-pages always come from the NORMAL > zone, hence the ZONE_DMA32 zone isn't needed. I avoided the new zone, as > I'm not 100% sure the VM is capable of keeping the zones it already has > balanced - and adding another one might break the camels back. But as the > test box has 4GB, it wasn't bouncing anyway.
You are right, this is definitely something that needs checking. I really want this to work though. Rik, Andrea? Will the balancing handle the extra zone?
-- Jens Axboe
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