I have been testing this days g4l and other options and I think that the
difference between old udpcast and new udpcast is that --nosync was a
default option ( with -p 'gzip -dc') and now it is not.
If I force --nosync it works ok with new kernels, so it is possible that
the were at the kernel.
I'm cloning machine now at 80Mb/s. For me, it's ok
thank you for all
El sáb, 26-11-2011 a las 09:40 +1000, Michael D. Setzer II escribió:
I maintain the g4l disk imaging project that includes
options, and on some occassions it has kernel support for
hardware that the website does yet support.
The latest version I have is
but the sourceforge site has the latest release version.
Generally, I use the lzop compression as default, since it is about
twice as fast as gzip, but does make a 10% larger image.
I haven't done a lot using PXE with the g4l, but have just copied
one of the kernel files and the ramdisk.lzma file and set it up using
PXE or Grub or Grub4DOS.
If you do try it, I would like to know if the hardware is seen and
works with the g4l..
On 25 Nov 2011 at 11:41, Raul Sanchez wrote:
From: Raul Sanchez <raul(a)um.es>
Date sent: Fri, 25 Nov 2011 11:41:58 +0100
Subject: [Udpcast] udp-receiver and gzip SLOW
I'm using udpcast for years and any problem has occurs to me.
Now we have bought new pcs and i wan't to use pxe + udpcast to clone
them. I have 2 differents types of network card and the others pieces
of the pcs are the same. The only different is the network chip
(AR8131 and AR8151)
I have my image un gzip mode and... I have made this tests
1. cast'o matcic kernel 2009 november. Works fine in AR8131. kernel
module (atl1c doesn't work with AR8151). (udp-receiver --file /dev/sda
-p 'gzip -dc') 2. Cast'o matic. Kernel 126.96.36.199. Works VERY SLOW using
gzip in AR8131 and AR8151. (udp-receiver --file /dev/sda -p 'gzip
-dc'). But works quick with udp-receiver --file /dev/sda without gzip
3. Boot with ubuntu 11.10 live cd. apt-get install udpcast.
udp-receiver --file /dev/sda -p 'gzip -dc' works fine so... 4. Install
makeImage in ubuntu 11.10. make initrd with modules and ... pxe +
initrd (11.10) + kernel 3.0.0-12 (and 13 too). same kernel and modules
than Ubuntu 11.10.udp-receiver --file /dev/sda -p 'gzip -dc' very slow
again. udp-receiver --file /dev/sda works fine 5. Same than 4, but
compiling busybox 1.18.5 and 1.19.xx and same result. Slow with gzip
6. ubuntu kernel + makeinitramfs + copy same libraries + copy busybox
(ubuntu 11.10) + copy udpcast (ubuntu 11.10 apt install) + copy gzip
(ubuntu 11.10). Same result. Slow with gzip 7. I have probe with
diverse versions of udp-receiver and udp-sender and the same result
(slow with gzip) 8. If you probe that cases with --nosync in
udp-receiver and gzip it works but when it have spent about 10 Gb,
So ... when you use old kernel and modules and network card is
supported it works fine.
New kernels and modules fails with gzip compression.
I have found that with 'ps' in pxe boots you can see several instances
of udp-receiver but in live cd you only see one. It can be by the way
ps show information. And I have boot appending maxcpus=1 option to the
kernel and the result has been the same.
In all cases network cards is working at 100Mbps
It seems that livecd after make the 'pivotroot' start any service or
"anything" that increases hard drive performance.
It will be nice any idea.
Thank you very much
Udpcast mailing list
Michael D. Setzer II - Computer Science Instructor
Guam Community College Computer Center
Guam - Where America's Day Begins
G4L Disk Imaging Project maintainer
Number of Seti Units Returned: 19,471
Processing time: 32 years, 290 days, 12 hours, 58 minutes
(Total Hours: 287,489)
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