Vladislav Bolkhovitin wrote:
Vu Pham wrote:
Vladislav Bolkhovitin wrote:
Robert Pearson wrote:
Vlad,
I think we agree. But, when we tried the experiment of running
without the
local memory allocator scst hung when we did large IO operations.
Probably
something simple.
Why do you think it scst hung, not something else? Do you have
evidences for that? ;) According to Vu, you can't simply switch to
SCST memory allocator, because IB hardware has very limited number of
available SG entries in commands (few tens), so for large request,
where there are too many SG entries, they should be "iomapped" using
the corresponding IB facility.
No - you can easily switch to SCST memory by set srpt's module
parameter mem_element=0. There is limited number of sg entries per IB
work request (29); however, the current srpt can submit several IB
work requests to cover large sg entries IO.
What's the point in the internal memory management in the SRPT driver then?
+ To avoid some back-end storage which can not handle big sg
entries
+ To save work requests
However, I agree that I need to remove srpt' internal memory
management.
-vu
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