On 29 Apr 2005, at 20:42, Jacob Gorm Hansen wrote:
is it possible, and will it make sense, to allow an SMP-domain access
to both SMT/Hyper threads of a CPU?
My performance measurements of the small address spaces implementation
(SAS) seem to indicate that having the driver domain in a separate
hyper thread is still a little faster than SAS for a non-SMP/SMT domU.
I guess that means that that SMT IPIs are about the same cost as ring
switches.
HT is designed to look almost identical to SMP, so it is no problem to
give both HTs to a multi-processor domain. This will make sense if the
domain is running a workload that benefits from HT (e.g., probably
certain types of multi-threaded application).
In most cases I expect it will give better overall performance to
allocate the second HT solely to a driver domain.
-- Keir
5 messages in com.xensource.lists.xen-develRe: [Xen-devel] Question about hyper-...