question : transfer size

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Jeff hello.
i have been measuring the transer size of  a request_t in
the deadline io scheduler dispatch request method.
i issued a dd of 1MB over a maxtor disk, which according
to the max_hw_sectors has 2048 sectors.
but in the scheduler i see only 1024 sectors.
So my question is:
where and how the transfer size is being determined ?
if i am going to expand the biovec size from 256 to 512
will it matter ?

thank you
--
Raz
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