Messages in this thread | | | Date | Fri, 13 Nov 2015 15:33:04 -0200 | From | Marcelo Tosatti <> | Subject | Re: [PATCH RFC] ioctl based CAT interface |
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On Fri, Nov 13, 2015 at 05:51:00PM +0100, Peter Zijlstra wrote: > On Fri, Nov 13, 2015 at 02:39:33PM -0200, Marcelo Tosatti wrote: > > + * * one tcrid entry can be in different locations > > + * in different sockets. > > NAK on that without cpuset integration. > > I do not want freely migratable tasks having radically different > performance profiles depending on which CPU they land.
Ok, so, configuration:
Socket-1 Socket-2
pinned thread-A with 100% L3 free 80% of L3 reserved
So it is a problem if a thread running on socket-2 is scheduled to socket-1 because performance is radically different, fine.
Then one way to avoid that is to not allow freely migratable tasks to move to Socket-1. Fine.
Then you want to use cpusets for that.
Can you fill in the blanks what is missing here?
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