Messages in this thread | | | Date | Mon, 31 Aug 2009 15:19:15 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: RFC: THE OFFLINE SCHEDULER |
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On Fri, 28 Aug 2009, Thomas Gleixner wrote:
> > slab does run a timer every 2 second to age queues. If there was activity > > then there can be a relatively long time in which we periodically throw > > out portions of the cached data. > > Right, but why does that affect a CPU which is marked "I'm not > involved in that game" ?
Its run unconditionally on every processor. System needs to scan through all slabs and all queues to figure out if there is something to expire.
> > The device may periodically check for conditions that require action. > > Errm. The device is associated to some other CPU, so why would it > require action on an isolated one ? Or are you talking about a device > which is associated to that isolated CPU ?
Some devices now have per cpu threads. See f.e. Mellanox IB drivers. Maybe there is a way to restrict that.
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