Date: Tue, 16 Aug 2016 16:18:26 +0200 From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com> To: <rainer@ultra-secure.de> Cc: Borja Marcos <borjam@sarenet.es>, <freebsd-xen@freebsd.org> Subject: Re: Is it me or is FreeBSD slower on Xen than Linux? Message-ID: <20160816141826.56mxsgx6e7rynxqg@mac> In-Reply-To: <c6bdef83f2370173c067820565bf933e@ultra-secure.de> References: <2a0a5ae2821551935de329b8665834be@ultra-secure.de> <20160816100605.la63x2ju5bmtdqhl@mac> <e62d4e94ec36fa859783ddc0aeb1aa28@ultra-secure.de> <20160816110759.6xlvxikw3tziahfd@mac> <c3a3a7da26cd1a6a114c03e823926272@ultra-secure.de> <20160816132938.d2i4u2y3scpzi2et@mac> <00D22384-BAA7-42E4-A486-4BE07562D011@sarenet.es> <8521aebaa093bcefe5956a71fd879140@ultra-secure.de> <872C5626-F58D-4F84-92AC-88B7352D1DDF@sarenet.es> <c6bdef83f2370173c067820565bf933e@ultra-secure.de>
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On Tue, Aug 16, 2016 at 04:05:30PM +0200, rainer@ultra-secure.de wrote: > Am 2016-08-16 15:48, schrieb Borja Marcos: > > > On 16 Aug 2016, at 15:41, rainer@ultra-secure.de wrote: > > > > > > Am 2016-08-16 15:38, schrieb Borja Marcos: > > > > > > > > Maybe this is too obvious, my apologies in that case. But, how have > > > > the filesystems been > > > > created and mounted? Asynchronous? Synchronous? Journalling? > > > > Softupdates in the case of > > > > FreeBSD UFS? It can make quite a difference. > > > > > > > > > FreeBSD > > > > > > /dev/ada2p1 on /home/db (ufs, local, soft-updates) > > > > > > > > > > > > Linux: > > > /dev/mapper/system-lvm--home /home ext4 defaults > > > 0 2 > > > > > > > > > What does "defaults" mean, BTW? > > > > That’s the mother of the lamb, we use to say in Spain ;) > > > > I guess it depends on the particular distribution, not just on being > > ext4. Is there a tool similar to > > dumpfs on Linux? > > > Apparently, it's in > cat /proc/mounts > > /dev/mapper/system-lvm--tmp /tmp ext4 rw,relatime,data=ordered 0 0 > /dev/mapper/system-lvm--var /var ext4 rw,relatime,data=ordered 0 0 > /dev/mapper/system-lvm--home /home ext4 rw,relatime,data=ordered 0 0 > /dev/mapper/system-lvm--varlog /var/log ext4 rw,relatime,data=ordered 0 0 > > > > > > You can also experiment with the FreeBSD options, maybe it will be a > > quicker route. Try to mount as asynchronous. > > In case it makes a big difference, you got it. > > But I don't really want to mount it asyncronous. > Would it help to have journaling? > > Or is soft-updates already the "optimum"? I'm not saying it's not possible, but are you sure this slowdown is caused by the disk? It's certainly a possibility, but I would like to make sure it's caused by that before jumping into conclusions. Can you load the full database in RAM and perform the same test. TBH, I don't use MariaDB, so I'm not sure what's the best way to achieve this, but a quick search on google shows there are multiple ways. In any case, make sure with iostat that the database is not read from the disk. Roger.
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