Chandra Seetharaman wrote: > On Mon, 2006-09-11 at 12:13 +0400, Pavel Emelianov wrote: > > <snip> > >>> Don't start the new container or change the guarantees of the existing >>> ones >>> to accommodate this one :) The QoS design (done by the administrator) >>> should >>> take care of such use-cases. It would be perfectly ok to have a container >>> that does not care about guarantees to set their guarantee to 0 and set >>> their limit to the desired value. As Chandra has been stating we need two >>> parameters (guarantee, limit), either can be optional, but not both. >>> >> If I set up 9 groups to have 100Mb limit then I have 100Mb assured (on >> 1Gb node) >> for the 10th one exactly. And I do not have to set up any guarantee as >> it won't affect >> anything. So what a guarantee parameter is needed for? >> > > I do not think it is that simple since > - there is typically more than one class I want to set guarantee to > - I will not able to use both limit and guarantee > - Implementation will not be work-conserving. > > Also, How would you configure the following in your model ? > > 5 classes: Class A(10, 40), Class B(20, 100), Class C (30, 100), Class D > (5, 100), Class E(15, 50); (class_name(guarantee, limit)) > What's the total memory amount on the node? Without it it's hard to make any guarantee. > "Limit only" approach works for DoS prevention. But for providing QoS > you would need guarantee. > You may not provide guarantee on physycal resource for a particular group without limiting its usage by other groups. That's my major idea.
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