Re: [Xen-devel] [PATCH v2] xen/credit scheduler; Use delay to control scheduling frequency

["Lv, Hui" <hui.lv@xxxxxxxxx>]

> Overriding the rate limit by the time slice isn't the right thing either, as 
> that
> (the way I "read" it) means there's no rate limiting at all.
> What "rate limit" to me means is preventing quickly switching away from a
> vCPU recently scheduled without extending its (remaining) time slice, i.e. in 
> any
> place a respective evaluation is done the shorter of the two should be used.
> 
> Jan

So the basic thing is to avoid "time slice" < "rate limit", happen.
I really don't understand why people want a 1ms time slice, but set the 
rate_limit to 5000(us), that is insubstantial.

If, this unfortunately happens, I prefer to put "rate_limit" at higher 
priority, which means extending the running time slice.
Some warnings should be put before the parameter of sched_ratelimit_us to avoid 
this.
Is this reasonable?


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