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zttest and jitter on new HP Proliant ML110G5

jonnytabpni
Posts: 379
 Member Since:
2007-03-21
Submitted by jonnytabpni on Wed, 04/23/2008 - 2:02pm.

Hey folks.

We just bought a brand new HP Proliant ML110 G5 with a Xeon 2.3 dual core CPU 1GB RAM.

There is a fair amount of jitter on it accross the whole of trixbox (Infact, jitter buffer makes it worse!). The frequency of the jitter is compariable to when you have a crappy ISP who drops packets (i.e. fairly randomily). ILBC is unuseable on a Nokia E65 however was working a bit bette ron a laptop. Basically I have problems with this everywhere.

Timing issue?? I've tried adding acip=on, acpi=off, clock=pit, internal_timing = yes to no avail!

Please help me here folks, im panicing!! We had an old Pentium 3 box with the exact same confiuration which ran perfectly!!

Maybe the HP USB controller isnt keeping time properly (There are no Zap cards installed)...

Please help!

Many Thanks

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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
i'm starting to think it's
Thu, 04/24/2008 - 5:16pm

i'm starting to think it's the network adapter.

Has anyone else had any problems with Broadcom adapters? Or Hp Servers?


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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
ok i think i've changed my
Thu, 04/24/2008 - 5:32pm

ok i think i've changed my mind!

I just ran zttest and got these outputs:

Opened pseudo zap interface, measuring accuracy...
99.959671% 99.942291% 99.769630% 99.944527% 99.960152% 99.944534% 99.960258%
99.960258% 99.943459% 99.960258% 99.943939% 99.960052% 99.944527% 99.960052% 99. 960258%
99.943649% 99.960556% 99.944237% 99.960152% 99.674019% 99.960152% 99.960258% 99. 944427%
99.960541% 99.769630% 99.960350% 99.960457% 99.944336% 99.960152% 99.944427% 99. 960648%
99.944145% 99.960449% 99.578712% 99.944435% 99.959862% 99.944336% 99.959862% 99. 944138%

99.960159%
--- Results after 40 passes ---
Best: 99.961 -- Worst: 99.579 -- Average: 99.927949, Difference: 100.030122

are they not pretty bad? How do i fix them? Thanks


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SkykingOH
Posts: 9541
 Member Since:
2007-12-17
I am still having problems
Thu, 04/24/2008 - 5:43pm

I am still having problems on an HP x4000

Tested, on a system with a Hardware Digium card AVG 99.978 and no problems.

On the HP with the problem 99.955

Since I don't have any more data I am not sure what to do with this info.

Like you, I need to find the root cause.

Scott

--

Scott

aka "Skyking"


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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
hi scott! Looks like we are
Thu, 04/24/2008 - 5:50pm

hi scott!

Looks like we are having very similar issues!

Have your tried putting the digium card in the HP?
Also, wot AVG are you getting with zttest on your HP? Cheers


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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
ok i have another notion. I
Thu, 04/24/2008 - 6:04pm

ok i have another notion.

I have had the feeling that my box becomes more stable the longer you leave it on. I just did a reboot and did another zttest:

Opened pseudo zap interface, measuring accuracy...
99.960052% 99.962791% 99.483696% 99.960449% 99.944138% 99.960541% 99.944237%
99.960838% 99.961044% 99.944138% 99.960541% 99.865028% 99.960648% 99.944145% 99.960350%
99.960350% 99.944046% 99.960449% 99.944344% 99.960350% 99.960449% 99.944138% 99.960648%
99.944237% 99.770020% 99.157524% 99.712502% 99.960556% 99.944145% 99.769630% 99.943947%
99.960258% 99.943947% 99.960350% 99.769722% 99.944237% 99.960350% 99.944336% 99.960449%
99.944336% 99.960747% 99.960258% 99.944336% 99.960365% 99.944336% 99.960449% 99.944336%
99.960350% 99.960747% 99.944237% 99.960449% 99.944138% 99.960747% 99.864944% 99.944237%
99.769630% 99.943748% 99.960350% 99.944237% 99.960350% 99.960052% 99.944046% 99.960350%
99.944336% 99.960648% 99.944344% 99.960449% 99.960258% 99.944237% 99.865234% 99.943947%
99.959755% 10.661031% 99.960350% 99.930664% 99.944237% 99.960350% 99.944237% 99.960449%
99.944237%
--- Results after 80 passes ---
Best: 99.963 -- Worst: 10.661 -- Average: 98.805552, Difference: 98.911927

Lower than what i got before (see above post)!!

Does anyone have any logic to put to this? Cheers


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SkykingOH
Posts: 9541
 Member Since:
2007-12-17
Those are average scores. I
Thu, 04/24/2008 - 6:53pm

Those are average scores.

I can't copy to the machine I am posting from as they are on different networks.

I also can't move the Digium card. It's not an Ethernet problem I my end I just checked the ifconfig stats.

Scott

--

Scott

aka "Skyking"


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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
sorry scott, it would help
Fri, 04/25/2008 - 12:29am

sorry scott, it would help if I could read properly!!

as you can tell from my scores, the timing varies...i'm guessing this correlates with the amount jitters occur


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jahyde
Posts: 2002
 Member Since:
2006-06-02
i was told by a digium
Mon, 04/28/2008 - 11:28pm

i was told by a digium support tech once that zttest is not 100% accurate - but he said usually when it gives a score below 99.98% there is bandwidth problem on the PCI bus (poor IRQ Handling). He said that some systems have shown lower scores that ran perfectly fine.

In this case I would say HP cut corners as much as possible, and that thing is having major IRQ issues. Most likely it is related to the drive controllers (they will usually dominate/rob IRQs over other devices).

What kind of hard drive(s)? And is it possible to turn off any other drive interfaces (IDE, Floppy, or 2nd un-used ports)? Is it possible to change the drive access mode? try a switching through any options available on the drive controller in the bios.

Dont get me wrong - Proliants are real nice, but i think the 110 line was on the low end. Personally i predominantly use Dell or Supermicro. Dell 840 is a great server in the same range ;) And Rhino also makes a fully certified appliance ;)

--

--my PBX is run on 2 V8's


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jonnytabpni
Posts: 379
 Member Since:
2007-03-21
hi jahyde please
Mon, 04/28/2008 - 11:33pm

hi jahyde

please see
http://www.trixbox.org/forums/trixbox-forums/help/help-no-sound-a...

for my posting there. I coudn't agree with you more sir! Poor IRQ handling indeed!!

I've tried everything from nosmp, turning off what i can (which is limited on this server) etc...

Cheers


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