[Bug 212681] I/O is slow for FreeBSD DOMu on XenServer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212681

            Bug ID: 212681
           Summary: I/O is slow for FreeBSD DOMu on XenServer
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: performance
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rainer at ultra-secure.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hi,

I run several FreeBSD VMs on Xen-Server 6.5 SP2

I/O is at least 5 times faster on Linux VMs than the FreeBSD VMs.
This also with FreeBSD 11-RC2.

Unfortunately, this is very noticeable in some workloads (MySQL esp.) and as a
result, I will not be able to use FreeBSD on our cloud-setup (we run our own
Apache CloudStack "cloud") except maybe for stuff like reverse-proxies etc.

An easy test to spot this is with dc3dd.

With dc3dd -wipe, I get over 100 MB/s in a Linux-VM, and maybe 20 in a FreeBSD
VM.

Tools etc. are installed, NICs show up as "xn", drives show up as "ada", for
what it's worth.

I've already posted in the freebsd-xen mailing list, but nobody used Xen-Server
there, apparently.
I also posted on Citrix's forum, but nobody bothered there, either.

I currently run about a 100 FreeBSD servers in various forms (physical and
virtual) and if nothing changes, this will probably be the end of it :-(

If anyone needs a VM to test, I can provide that, too (and access to the
CloudStack GUI for that particular VM).

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