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Re: [Xen-devel] planned csched improvements?

On 12/10/2009 08:27, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>> there's a migration delay (default is 1ms) to judge cache hotness and
>> thus avoid unnecessary migration. However so far it's only checked
>> when one cpu wants to steal vcpus from other runqueue. Possibly it
>> makes sense to add this check to csched_vcpu_acct, as a cold cache
>> and cascade of other VCPU migrations could easily beat benefit on a
>> "more idle" socket.
> Where do you see this 1ms delay - I can't seem to spot it...

The option of interest is vcpu_migration_delay, but it defaults to zero
(disabled). Intel explicitly set it to 1000 (1ms) for their tests.

 -- Keir

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