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List:       linux-rdma
Subject:    fmr pool and remap doubt
From:       <Parav.Pandit () Emulex ! Com>
Date:       2012-04-30 15:56:33
Message-ID: c4b18172-e422-4b29-a733-4b701f8def5d () exht1 ! ad ! emulex ! com
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Hi,

I am trying to understand remapping functionality and fmr_pool.c.
Looking back at old thread: \
http://lists.openfabrics.org/pipermail/general/2006-February/017198.html

Can you please confirm whether my understanding is correct or not.
1. max_map_per_fmr  indicates that - different memory pages can be remapped (again) \
without invoking unmap_fmr(). Basically previous mapping is over-written on every \
map_phys_fmr() call with new mapping without doing unmapping.

2. adapter indicates above limit - how many times old mapping can be overwritten \
(remapped) before invoking unmap_fmr().

3. Remapping allows faster operation compare to map(), unmap() sequence, due to which \
unmap_fmr() is mostly done in worker threads in SDP, RDS etc consumers.

Is above understanding correct?

Regards,
Parav Pandit

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