On Thu, Nov 18, 2010 at 7:20 AM, Alan Altmark <[email protected]> wrote:
> Also, a guest's ability to use an OSA is limited by the guest's access to > the CPU. Very much. In many scenarios that I worked on, disk I/O throughput or CPU was the limiting factor. I still recall one case where the customer did a Hipersockets benchmark showing only a few MB/s. They were using "scp" to transfer from a guest in one z/VM LPAR to the other. Both LPARs shared the same (single) CPU and he assured me CPU was not the bottleneck because both LPARs used only 50% of the capacity... Obviously they really measured symmetrical encryption and decryption in openssh rather than Hipersockets bandwidth. Having real data from the experiment helps a lot, though it's still not trivial to explain all factors. Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/
