On Mon, 3 Aug 2020 15:08:28 +0200 Matthias Petermann <m...@petermann-it.de> wrote:
> I measured this by copying an 8 GB ISO file from a Windows host. > In constellation 2, no guests had started and the full main memory of > Dom0 was assigned. In my view, the only significant difference is > that NetBSD can only use one of the two CPU cores under Xen. Since > the CPU was idle on average at 20% during copying, that doesn't seem > to be the bottleneck? I believe Samba is single threaded, so can't take advantage of multiple CPUs for a single stream. I'm not a Xen expert, however I'm not sure running this in Dom0 is a representative test. I imagine most workloads would be done within a DomU, while Dom0 is just a control domain and allocates CPU and memory resources, so you may have additional overheads + latencies. Best to start testing simple use-cases, i.e. simple disk I/O with dd, or network I/O with iperf, and narrow down the issue.
