RE: [Xen-ia64-devel] Time for hybrid virtualization?

[Alex Williamson <alex.williamson@xxxxxx>]

Hi all,

   I got a pointer to re-aim-7 and thought the high-systime workload
might give us a good worst case scenario.  This workload does no I/O and
a lot of the tests produce very high system time.  Here's the results:



                 Max JPM
             % of native
Native
               242347.19
                 100.00%
Para-virt
               218694.95
                  90.24%
Full-virt
                58289.32
                  24.05%

Not a pretty picture for HVM.  My test system is a 2-socket, dual core
Montvale w/ threads disabled (4-way), 16GB RAM total.  This is the same
system I used for the kernel build tests.  The guest domain was
configured for 4-way, 8G, and I used mem=8G to get the native test to
use the same.  PV-on-HVM drivers did not improve the full-virt numbers.
I've attached a graph of the runs.  This is obviously a concern for a
VT-mode dom0.  We probably need to profile the HVM run to see if these
are things that could be easily paravirtualized for a hybrid mode guest.

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.

Attachment: reaim.pdf
Description: Adobe PDF document

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