On Tue, Jun 26, 2007 at 11:11:25AM -0400, Muli Ben-Yehuda wrote: > On Tue, Jun 26, 2007 at 08:03:59AM -0700, Arjan van de Ven wrote: > > Muli Ben-Yehuda wrote: > > >How much? we have numbers (to be presented at OLS later this week) > > >that show that on bare-metal an IOMMU can cost as much as 15%-30% more > > >CPU utilization for an IO intensive workload (netperf). It will be > > >interesting to see comparable numbers for VT-d. > > > > for VT-d it is a LOT less. I'll let anil give you his data :) > > Looking forward to it. Note that this is on a large SMP machine with > Gigabit ethernet, with netperf TCP stream. Comparing numbers for other > benchmarks on other machines is ... less than useful, but the numbers > themeselves are interesting. Our initial benchmark results showed we had around 3% extra CPU utilization overhead when compared to native(i.e without IOMMU). Again, our benchmark was on small SMP machine and we used iperf and a 1G ethernet cards.
Going forward we will do more benchmark tests and will share the results. -Anil - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
