Belkin XM Commander Manuale Utente Scaricare il pdf (Pagina 41)

warpu the unwarp requirement is the minimum time a domain must run unwarped for

before it can warp again

7.4.2 Atropos

sched=atropos

Atropos is a soft real time scheduler. It provides guarantees about absolute shares

of the CPU, with a facility for sharing slack CPU time on a best-effort basis. It can

provide timeliness guarantees for latency-sensitive domains.

Every domain has an associated period and slice. The domain should receive ‘slice’

nanoseconds every ‘period’ nanoseconds. This allows the administrator to conﬁgure

both the absolute share of the CPU a domain receives and the frequency with which it

is scheduled.

Note: don’t overcommit the CPU when using Atropos (i.e. don’t reserve more CPU

than is available — the utilisation should be kept to slightly less than 100% in order to

ensure predictable behaviour).

Per-domain parameters

period The regular time interval during which a domain is guaranteed to receive its

allocation of CPU time.

slice The length of time per period that a domain is guaranteed to run for (in the

absence of voluntary yielding of the CPU).

latency The latency hint is used to control how soon after waking up a domain it

should be scheduled.

xtratime This is a boolean ﬂag that speciﬁes whether a domain should be allowed a

share of the system slack time.

7.4.3 Round Robin

sched=rrobin

The round robin scheduler is included as a simple demonstration of Xen’s internal

scheduler API. It is not intended for production use.

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Belkin XM Commander Manuale Utente Pagina 41