Is it me or is FreeBSD slower on Xen than Linux?

[rainer at ultra-secure.de]

Am 2016-08-16 12:06, schrieb Roger Pau Monné:
> On Tue, Aug 16, 2016 at 11:29:43AM +0200, rainer at ultra-secure.de wrote:
>> Am 2016-08-16 10:54, schrieb Roger Pau Monné:
>> > On Mon, Aug 15, 2016 at 05:54:52PM +0200, rainer at ultra-secure.de wrote:
>> > > Hi,
>> > >
>> > > I've got a problem.
>> > >
>> >
>> > Hello,
>> >
>> > >
>> > > For a customer, I run a VM in Xen that should perform a certain task
>> > > in PHP
>> > > (written using the ZendFrameWork).
>> > >
>> > > That task takes about 18-20 seconds on FreeBSD 10.3 amd64, MariaDB
>> > > 5.5.0,
>> > > php 5.5.37 in a VM that has 8 vCPUs and 16GB of memory
>> > > The "reference" server that the customer uses is somewhere else and
>> > > manages
>> > > to perform the same task in 3s.
>> > >
>> > > I've tried this with FreeBSD 10.3, PHP7.0 and MariaDB 10.1 and it
>> > > takes
>> > > about 9s.
>> >
>> > In the sentence above, are you running it in a Xen VM or on bare metal?
>> >
>> 
>> This is both Xen.
>> I think the customer is also running it on some sort of 
>> virtualization.
> 
> Hm, so a given workload on Xen takes ~9s, and it also takes ~9s when 
> run on
> bare metal FreeBSD, is that right?


It only takes 9s with Linux as a Xen-guest.
With all things equal (PHP-version, MariaDB-version), FreeBSD is 
essentially only half as fast as Linux as a Xen-guest.
Sorry for the confusion.



>> > hw.xen.disable_pv_disks=1
>> > hw.xen.disable_pv_nics=1
>> 
>> OK, can I still boot the VM with this or will NICs and disks show up 
>> as
>> different devices then?
> 
> NIC will show up as "re", disks as "ada" (which is what you already 
> have).

I tried this with the FreeBSD 11 VM mentioned in my other mail and it 
only gets a bit slower.
Between 5% and 10%, I'd say.