[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v8 for-xen-4.5 2/2] dpci: Replace tasklet with an softirq (v8)

>>> On 27.10.14 at 12:09, <andrew.cooper3@xxxxxxxxxx> wrote:
> Can it ever be the case that we are waiting for a remote pcpu to run its
> softirq handler?  If so, the time spent looping here could be up to 1
> scheduling timeslice in the worst case, and 30ms is a very long time to
> wait.

Good point - I think this can be the case. But there seems to be a
simple counter measure: The first time we get to this point, send an
event check IPI to the CPU in question (or in the worst case
broadcast one if the CPU can't be determined in a race free way).


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.