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@FreeBSD.org
Reporter: rai...@ultra-secure.de
CC: freebsd-am...@freebsd.org
CC: freebsd-am...@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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