Mike Christie wrote:
>
> The problem is that we assume we will get nice large segments. When
> using sg it will try to allocate multiple pages and make large segments.
> We could hit a bad case where we cannot allocate enough large segments,
> so a worst case would result in a max_segment_size of PAGE_SIZE:
>
> max_segments = min(q->max_hw_segments, q->max_phys_segments);
>
> max_xfer = min(q->max_hw_sectors * 512,
> max_segments * PAGE_SIZE);
>
> return max_xfer;
>
Oh yeah, you could also check how large the reserved buffer is already.
The estimate above does not take into account if we had already
allocated a nice large reserved buffer with large segments.
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