[Udpcast] udpcast gzip and lzop

D Teed dteed at artistic.ca
Tue Dec 27 16:04:32 CET 2005


In udpcast it is normal to get some "timeout not answered"
when the receiving buffer is full and the bottleneck is
on the compression or write to disk.  It just means the
sender wanted to provide more data and the receiver
couldn't handle it at that second.

However the other errors are more significant and cause
real failure.  I'd try another client machine and see if
the same happens, or boot up a Linux rescue disk/CDROM
of some sort and try a memory testing program to see if that
part of the hardware is reliable when pushed for 30 minutes
or more.

--Donald Teed

On Tue, 27 Dec 2005, Pierre CANAL wrote:

> Hello,
> I use udpcast for test. I make and image of /home with or without
> compression perfectly.
> But when I want to send image , if there is no compression it's Ok (some
> timeout notAnswered[0]...but finally it's ok)
> When  I use lzop or gzip, I get an error sometimes on the sender, sometimes
> on the sender :
> I have a lot of
> Timeout notAnswered=[0} notReady=[0] nrAns=0 nrReady=0 nrPart=1 avg=8121 and
> so on...
> Dropping client because of timeout lzop <stdin> checksum error...
> or invalid operand PREEMPT and crash server ! process udp-sender Stack ...
> Call Trace ...
> or Gzip stop Bad EIPvalue SIGSEGV ....
> And strange thing ..
> With no compression the speed is 80Mbps
> with lzop 20 Mbps
> with gzip 7Mbps
> My CPU is an Athlon 2400+ (not so bad), I use kernel 2.6.8 on a Debian
> Sarge.
> Any ideas ?
> Thanks
> Pierre

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