Messages in this thread | | | Date | Thu, 15 Nov 2001 19:07:14 +0100 (CET) | From | Gérard Roudier <> | Subject | Re: [PATCH] small sym-2 fix |
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On Thu, 15 Nov 2001, David S. Miller wrote:
> From: Gérard Roudier <groudier@free.fr> > Date: Thu, 15 Nov 2001 17:27:38 +0100 (CET) > > The driver should not need more than 4096 bytes for a single allocation. > > If platform is 64-bit and PAGE_SIZE < 8K, yes it will. > And ppc64 fits this criteria.
Btw, I didn't see any ppc64 stuff in linux kernel. As a result this platform is still in the unsupported status. :-)
Indeed a 4K page on a 64 bit machine looks very suboptimal. Note that it is also way too small for 32 bits machines with hundreds of megabytes of memory. I am wondering about the reasons that made us keep with so small a page size. As you know earlier BSDs used 2K on Vaxen that as you also know had (have?) a physical PAGE_SIZE of 512 bytes.
About the sym-2 driver, it may well be some pointers that make it need more than 4K allocation on 64 bit machines.
I will try to make it fit a page size max allocation even on such weird configuration, since I do consider as high^H^H^H^Hslightly broken any piece of software that requires more that 1 PAGE of physically contiguous allocation. :-) :-) :-)
To be serious, the right fix is to have some logical page be some power of two of the physical page when the physical page is too small. Can we hope Linux-2.5 to allow this?
Gérard.
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