View Full Version : SB3 rebuffering and not recovering

2008-02-06, 06:54
I'm having an intermittent problem with my new SB3 - every once
in a while (sometimes once a week, sometimes twice a day) I get
the message Rebuffering 1% (or 2%) ... and the SB3 hangs at this
point. All my music is high bitrate VBR mp3.

Is there anything I can do to diagnose this problem? The
rebuffering itself I can live with if the SB3 recovered, filled
its buffer and kept playing, but it doesn't seem to do that. I
followed the advice of a previous poster and set the SB3 to
static IP (it was previously DHCP) but that didn't help.

The SB3 is wireless and replaced an SB1 wireless at the same
location. The SB1 didn't have any troubles there. Wireless signal
is about 70-80% and there are no APs on the same channel.
I tried a network test at 320 kbps and was able
to get 98%. I'm running the latest 7.0 nightly and firmware.

Thanks for any advice or suggestions!

Mark Lanctot
2008-02-06, 07:51
I tried a network test at 320 kbps and was able
to get 98%.

Wait a sec, you only get 98% at 320 kbps?!?

That indicates a very severe wireless bandwidth problem. It's amazing it works at all.

You should be getting 100% at 1000 kbps at least (and that won't allow you to play anything but MP3s, no FLAC or WAV).

2008-02-09, 07:28
Ouch, this problem hit me hard during a party where the
SB3 hit the rebuffering problem 3 times during the night.
I tried a network test right after one of the incidents
at 320 kbps and it hit 100%.

Do I have a defective SB3? The Squeezebox didn't win any
new converts tonight unfortunately. I'm still wondering
why the SB3 doesn't recover. Back in the old days I had
a SLIMP3 in a marginal wireless area in my house and on
the occasions that it did skip, it always recovered and
continued playing eventually.

Phil Leigh
2008-02-09, 07:42
The SB3 has a much larger buffer than the SB1.
Something is badly wrong with your wireless network (not the SB). Probably interference from something. Do you have your PC wired to the router or are both the PC AND SB talking wirelessly to the router?

2008-02-09, 08:09
The PC is wired to the router. The router is a Linksys WRT54G
with Tomato Firmware.

Tomato reports signal quality of 41 for the SB3, signal quality
for the 2 SB1s in more remote areas of the house are 44 and 47.
I never have problems with the SB1s. It is odd that the signal
quality for the SB3 is lower, as it sits in the next room from
the access point with only 1 wall in between.

The SB3 itself reports 73 for signal strength, with the more
remote SB1s reporting 60 and 68, which makes a little more sense.

For a while I had increased the power output of the access
point to help with some Jive Hardware Beta issues, but I dropped
it back down to default. I may try boosting it again to see if
that helps matters.

2008-02-09, 08:13
I'm still wondering
why the SB3 doesn't recover.

Another user has a similar symptoms ( http://forums.slimdevices.com/showthread.php?t=42935 ) and Andy has logged bug #6931 to add in a timeout.

However it may be a different bug - does this behaviour happen with all stations or just a defined set ?

2008-02-09, 08:17
I'm not sure it's the same issue, but the resolution might help
me - not getting stuck on the rebuffering phase.

I'm not using Squeezenetwork or Internet radio when this happens,
it is all my own local mp3 files. Thanks for the pointer to the

2008-02-09, 08:23
Ooops didn't notice the "files" bit.

I presume no special features are in use such as sync or bit rate limiting.

2008-02-09, 09:20
I've been trying to keep things as simple as possible while
trying to figure it out - there's no sync or rate limiting when
the rebuffer occurs. I'm going to have to start trying some of
the debug settings next.

2008-02-09, 10:16
One thing that I can't figure out is why there is such a large
burst in traffic between the SB3 and the server on each song

The attached graph shows spikes up to 5600 kbps during the 4 song transitions while the normal data flow during playback is around
200 kbps.

I've confirmed this with a packet analyzer - what's causing the
spikes, and might that cause problems on a wireless network?

Ben Sandee
2008-02-09, 10:50
On Feb 9, 2008 11:16 AM, jth <
jth.34ix7b1202577601 (AT) no-mx (DOT) forums.slimdevices.com> wrote:

> One thing that I can't figure out is why there is such a large
> burst in traffic between the SB3 and the server on each song
> transition.

Because when playing local files (MP3, FLAC, etc) it completely fills the
SB3 buffer at the beginning of each track and it does so at the maximum data
rate. If it didn't do this then there would be much less dropout

In an ideal world SlimServer would not rebuffer at the beginning of each
track but would begin filling the playback buffer with the next track as
soon as there is room in the buffer. I suspect that a change in this
behavior might be part of what will eventually allow for sync'd gapless
playback, but I'm just speculating.


2008-02-09, 10:51
One thing that I can't figure out is why there is such a large
burst in traffic between the SB3 and the server on each song

It's filling the buffer as fast as it can, then it trickle feeds to keep the buffer full during playback.

2008-02-09, 12:14
Of course ... that makes perfect sense. I'm just going to turn on
as much debugging info as I can and let it run all day.