Re: [Xen-devel] [RFC v1 0/5] VBD: enlarge max segment per request in blkfront

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.08.12 at 12:22, "Duan, Ronghui" <ronghui.duan@xxxxxxxxx> wrote:
> The max segments for request in VBD queue is 11, while for Linux OS/ other 
> VMM, the parameter is set to 128 in default. This may be caused by the 
> limited size of ring between Front/Back. So I guess whether we can put 
> segment data into another ring and dynamic use them for the single request's 
> need. Here is prototype which don't do much test, but it can work on Linux 64 
> bits 3.4.6 kernel. I can see the CPU% can be reduced to 1/3 compared to 
> original in sequential test. But it bring some overhead which will make 
> random IO's cpu utilization increase a little.

In what way to improve blkback is intended to be subject of a
discussion on the summit - are you by any chance going to be
there? Fact is that there are a number of other extensions to
the interface, and since you don't mention those I'm assuming
you were not aware of them.

Jan


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