Date: Tue, 16 Aug 2016 12:13:55 +0200 From: rainer@ultra-secure.de To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com> Cc: freebsd-xen@freebsd.org Subject: Re: Is it me or is FreeBSD slower on Xen than Linux? Message-ID: <e62d4e94ec36fa859783ddc0aeb1aa28@ultra-secure.de> In-Reply-To: <20160816100605.la63x2ju5bmtdqhl@mac> References: <b0fdde5d7abf905ca6dfd176f028332e@ultra-secure.de> <20160816085455.46a5slqsbgauod5t@mac> <2a0a5ae2821551935de329b8665834be@ultra-secure.de> <20160816100605.la63x2ju5bmtdqhl@mac>
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Am 2016-08-16 12:06, schrieb Roger Pau Monné: > On Tue, Aug 16, 2016 at 11:29:43AM +0200, rainer@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@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.
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