[dm-devel] Re: [PATCH 3/3] dm-mpath: add service-time oriented dynamic load balancer

[Alasdair G Kergon]

On Fri, May 15, 2009 at 12:09:21PM +0900, Kiyoshi Ueda wrote:
> However, if I limit the 'perf' value in smaller range (e.g. 0 to 100),
> such overflow shouldn't happen.  So I should be able to use
> multiplication.  Also, I don't need to use size_t for 'perf',
> because 'unsinged' should be enough for such small values.
 
I think a small range would be adequate - look at the number sizes and
go 0-100 or 0-1000 as appropriate.

Thinking of naming, is it 'relative_throughput' ?

However, is it also going to be possible to extend this target to measure the
the actual throughput?  If we did that, would we use a special value to 
indicate it or add a new table parameter and keep the 'perf' ones as a
manual adjustment factor applied on top of the calculated one?

Alasdair