[Freeswitch-users] OpenVZ tuning tips

Sat May 25 19:46:09 MSD 2013

Debian FTW!

- BDF
On May 25, 2013 10:49 AM, "Ken Rice" <krice at freeswitch.org> wrote:

>  I actually dropped using Centos6 and moved to debian to get both timerfd
> and to get performance at the same time. And things started working much
> nicer... Not sure if they even fixed the performance issues on centos tho
>
>
> On 5/25/13 4:52 AM, "Yuriy Nasida" <nasida at live.ru> wrote:
>
> Tamas,
>
> I think you can find info about performance problems with CentOS 6 on
> jira.
> For example. http://jira.freeswitch.org/browse/FS-4291
>
> We also wanted to use timerfd (without virtualization) and  made a moving
> to latest cenos 6.(2,3) + FS 1.2.8 . It was big mistake. FS got frozen
> sometimes. As a result we had to move on centos 5.9 again.
>
> I would like to join issue. how can I be sure that timerfd is used?
>
> Regards,
> Yuriy
>
> ------------------------------
> Date: Sat, 25 May 2013 07:52:28 +0200
> From: jalsot at gmail.com
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] OpenVZ tuning tips
>
> We've tried as root user but as I remember it was not able to set up the
> priority but will recheck to be sure. Another interesting thing is that
> when I tried to set a running process scheduler with chrt, got operation
> not permitted (as root of course), so I guess, something has to be tuned in
> the VE or on the host. We will try on bare metal centos6+ovz on the host.
> We try the latest centos6 with latest openvz kernel (due to security
> requirements we run on latest stable kernel and OS versions).
> Could you give some info about those horrible performance problems to let
> us check whether it still applies or not? (we've found only mysql create
> table performance degradation due to ext4 - where the solution could be
> barrier=0 yet, no other problems).
> Actually, how can I be sure that timerfd is used? strace? I'm nearly sure
> that timerfd works fine in FS.
>
> Yep, it would be much simpler without virtualization, and much harder from
> another perspective. Probably lxc, kvm and xen aren't much better regarding
> realtime stuff...
>
> Regards,
>    Tamas
>
>
> On Fri, May 24, 2013 at 11:28 PM, Anthony Minessale <
> anthony.minessale at gmail.com> wrote:
>
> It will only work running as root I believe because it needs high privs to
> do realtime.
> If you do use centOS make sure its the latest rev of cent6, we have some
> horrible performance problems on the earlier revs and I don't know if they
> were resolved.
> Just make sure your kernels are as new as you can get them on the real
> host to avoid years of kernel performance bugs and that it has support for
> timerfd otherwise your VE would compile with timerfd support but not have
> actual access to the real syscalls for it in the host.
>
> That's why we try not to recommend virtual stuff in general as it takes
> some very careful setups and its hard to support from our standpoint when
> people run into issues.
>
>
>
>
>
> On Fri, May 24, 2013 at 12:30 AM, Tamas Jalsovszky <jalsot at gmail.com>
> wrote:
>
> Hello,
>
> Thank you for tips, we are testing centos/openvz 6 with 2.6.32 kernel on
> host and Ubuntu 10.04 LTS in VE.
> Do you know maybe how to allow realtime priority in the VE for FS? Running
> FS with -rp does not set the scheduler.
> strace says, sched_setscheduler operation permitted, so SCHED_FF is not
> set. Tried to run as root and/or use ulimit -r option, but cannot run FS
> with tuned priorities.We guess, some thing missing in the host/VE
> configuraton.
> Any idea?
>
> Br,
>   Tamas
>
>
> On Thu, May 23, 2013 at 12:47 AM, jay binks <jaybinks at gmail.com> wrote:
>
> Im using 2.6.32 on all my boxes ...
>
> One thing that has me thinking,  are there any tweaks to get MSI-X working
> best it can ? ( with proxmox )
> there seems to be a strong bias towards one CPU for all interrupts.
>
> I could be wrong, but its something I think ive seen, and didnt see any
> clear suggestions on.
>
> Jay
>
>
>
>
>
> On 23 May 2013 01:12, Anthony Minessale <anthony.minessale at gmail.com>
> wrote:
>
> 2.6.25 or newer to get timerfd support.
>
>
>
> On Wed, May 22, 2013 at 2:56 AM, Zenny <garbytrash at gmail.com> wrote:
>
> On 5/22/13, Anthony Minessale <anthony.minessale at gmail.com> wrote:
> > You should consider centos6 or debian stable.  Make sure the host kernel
> is
> > very new to get maximum results.
>
> Tony, do you mean "very new kernel" means 3.2.xx kernel?
>
> Openvz host kernel is still at 2.6.32 so bleeding edge kernel is not
> possible. And that is what CentOS6 offers, too.
>
> However, I installed FS as openvz guest, it works fine for outgoing,
> but not DNAT works for incoming connections even after throroughly
> following
> http://wiki.freeswitch.org/wiki/NAT_Traversal#FreeSWITCH_behind_NAT.
>
> Just my two cents.
>
>
>
> >
> >
> > On Tue, May 21, 2013 at 2:53 PM, Tamas Jalsovszky <jalsot at gmail.com>
> wrote:
> >
> >> Hello,
> >>
> >> Do you have any recommendations regarding how to set up correctly (for
> >> production) CentOS5 openvz and FS 1.2.stable? Is there any trick to
> >> tuneup
> >> the system to be rock solid?
> >> Right now we use centos5 openvz and ubuntu 10.04 LTS in container with
> FS
> >> 1.2.8 and RTP deltas are varying from 15 to around 40ms. We guess that
> >> something is not well configured around timers, however mod_posix_timer
> >> did
> >> not help anything (running FS with -rp). We use our own bare metal and
> >> can
> >> reproduce those delatas eirher when only one VE is on the HW.
> >> Maybe time to check out centos6 with openvz?
> >>
> >> Any idea, recommendation, experience can be very helpful.
> >>
> >> Regards,
> >>    Jalsot
> >>
> >>
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> >
> >
> > --
> > Anthony Minessale II
> >
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> --
> Ken
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