http://kerneltrap.org/node/8176
I am a mdadm/disk/hard drive fanatic, I was curious:
On i386, we can at most fit 256 scatterlist elements into a page,
and on x86-64 we are stuck with 128. So that puts us somewhere
between 512kb and 1024kb for a single IO.
How come 32bit is 256 and 64 is only 128?
I am sure it is something very fundamental/simple but I was curious, I
would think x86_64 would fit/support more scatterlists in a page.
Also, when this patch is implemented for x86_64 and if merged into
mainline, what does this mean for performance?
I have an mdadm raid5 of 10 raptors and get 434MB/s write and 622MB/s
read, would I see an increase in performance with this patch?
Justin.
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