On 03/09/15 17:15, David Vrabel wrote:
On 03/09/15 17:01, Ben Catterall wrote:
Intel Intel 2.2GHz Xeon E5-2407 0 processor:
--------------------------------------------
1.55e-06 seconds was the average time for performing the write without the
deprivileged code running.
5.75e-06 seconds was the average time for performing the write with the
deprivileged code running.
So approximately 351% overhead
AMD Opteron 2376:
-----------------
1.74e-06 seconds was the average time for performing the write without the
deprivileged code running.
3.10e-06 seconds was the average time for performing the write with an entry and
exit from deprvileged mode.
So approximately 178% overhead.
How does this compare to the overhead of passing the I/O through to qemu?
So, passing this portio op through to QEMU takes roughly 20e-6 seconds.
However, I don't know if the emulator would have gone and prodded a
physical port as port of that which could skew the result. I'll look
into this and get back if I find anything to clarify this.
Ben
David
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
