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Posts tagged ‘ubuntu’

1
Sep

Skype on Ubuntu 11.10 (Oneiric Ocelot)

If you upgrade to Ubuntu 11.10 on a 64-bit platform and try to run skype then you will likely get this error:

skype: error while loading shared libraries: libXss.so.1: cannot open shared object file: No such file or directory

This is because libxss1 and a few other libraries have been removed from ia32-libs package.

You will need to enable multiarch and install the extra 32 bit libraries by hand:
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28
Apr

Ubuntu 11.04 Natty with fglrx and 2.6.39

Natty (11.04) users can finally get fglrx playing nicely together with X.org 1.10. We can also make the latest driver work well with the 2.6.39 kernel.

Custom build procedure:

  1. Install the latest 2.6.39 kernel revision from Ubuntu Mainline or install the PPA.
  2. Download 64-bit 11.4.
  3. Extract the files from the package:
    sh ./ati-driver-installer-11-4-x86.x86_64.run --extract ati
  4. For 2.6.39 support, download this extra patch: 2.6.39_bkl.patch
  5. Check for Big Kernel Lock usage:
    cat /lib/modules/`uname -r`/build/.config | grep -c CONFIG_BKL=y
    If the result of this command is 0, then download no_bkl.patch as well.
  6. then apply them:
    cd ati; for i in ../*.patch; do patch -p1 < $i; done
  7. Build your new ati/fglrx deb packages:
    ./ati-installer.sh 8.841 --buildpkg Ubuntu/natty
  8. Install our newly created deb packages:
    sudo dpkg -i ../fglrx*.deb
  9. If your /etc/X11/xorg.conf is missing you will need to run:
    sudo aticonfig --initial
    and then reboot.

That newly created package should work for the entire 2.6.39 series.

30
Mar

Ubuntu 2.6.39 kernel and fglrx 8.831

For those 10.10 Maverick users with 2.6.38 or 2.6.39 (64-bit) kernels, you can get fglrx playing nicely together with X.org 1.9.

Unfortunately this new driver does not support X.org 1.10 and that leaves 11.4 users to use the open-source drivers.

Custom build procedure:
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28
Mar

Wireless BCM4312 on Ubuntu with 2.6.38 and 2.6.39 kernel

Broadcom Chipset BCM4312

My Vostro 1510 comes with an on-board wireless miniPCI card but it does not work “out of the box” with Ubuntu, even with the latest 2.6.39 kernel. The only option that works for me is the binary hybrid blob driver provided by Broadcom, but even that is out of date. They need help in order to work with 2.6.36 and upwards and I have a patch for that.

Chipsets supported by “Broadcom’s IEEE 802.11a/b/g/n hybrid Linux┬« device driver” are: BCM4311, BCM4312, BCM4313, BCM4321, BCM4322, BCM43224, and BCM43225, BCM43227 and BCM43228.

The my exact chipset from lspci command:

Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

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28
Feb

Infiniband on Ubuntu 10.10 Meerkat

My current project that involves hundreds of mini-ITX Atom machines and we are testing the performance difference between Infiniband and Intel Gigabit NICs.

In my testing the overhead of processing TCP is too high for a dual-core Atom. There is simply not enough processing power to handle the capabilities of the Intel NICs.

A possible solution is to replace TCP by using SDP (RDMA and Zerocopy) over Infiniband. Infiniband equipment has come down significantly in price (dual port 4xSDR card for around $50), which makes it attractive to high-performance and cost-sensitive applications like mine.

In theory we can get 4xSDR speeds (8 Gigabit/s), but the tested result is 1.5 Gigabit/s speeds because of TCP processing over Infiniband. This is almost exactly the performance we achieved using the Intel NICs. We then replaced TCP with SDP over Infiniband. With the switch we saw 4.2 Gigabits/s performance on one process. With two processes, one for each core of the Atom, we saw 7.8 Gigabit/s which is close to the theoretical limit of the Infiniband NIC.
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