** Description changed: I have installed KUbuntu on a USB stick, for use on an Intel Atom system. Before the 9.10 upgrade this was working fine, but since the upgrade the performance was unacceptable. The system is very slow when I/O operations are done to/from the USB stick, and the kernel reports a lot of strange messages. I have tried to google some solution, but found nothing. As a last resort, I reinstalled the system, with a brand new Kubuntu 9.10 installation, and to my surprise the performance is still horrible. When I run "dmesg" during some I/O operation (logging into KDE is heavy enough to slow down the system), these messages appear: [ 190.160047] usb 1-2: reset high speed USB device using ehci_hcd and address 3 [ 198.160049] usb 1-2: reset high speed USB device using ehci_hcd and address 3 [ 198.340836] CPU0 attaching NULL sched-domain. [ 198.340850] CPU1 attaching NULL sched-domain. [ 198.340857] CPU2 attaching NULL sched-domain. [ 198.340863] CPU3 attaching NULL sched-domain. [ 198.380192] CPU0 attaching sched-domain: [ 198.380202] domain 0: span 0,2 level SIBLING [ 198.380209] groups: 0 2 [ 198.380219] domain 1: span 0-3 level CPU [ 198.380224] groups: 0,2 1,3 [ 198.380237] CPU1 attaching sched-domain: [ 198.380243] domain 0: span 1,3 level SIBLING [ 198.380248] groups: 1 3 [ 198.380257] domain 1: span 0-3 level CPU [ 198.380262] groups: 1,3 0,2 [ 198.380273] CPU2 attaching sched-domain: [ 198.380278] domain 0: span 0,2 level SIBLING [ 198.380284] groups: 2 0 [ 198.380292] domain 1: span 0-3 level CPU [ 198.380298] groups: 0,2 1,3 [ 198.380308] CPU3 attaching sched-domain: [ 198.380313] domain 0: span 1,3 level SIBLING [ 198.380319] groups: 3 1 [ 198.380327] domain 1: span 0-3 level CPU [ 198.380333] groups: 1,3 0,2 This will go on and on, for as long as I/O is taking place. Because of the slowdown, logging on in KDE takes many minutes... This was not happening in 9.04; I'm guessing this is something in the new kernel. Used system: - NVidia ION (Intel Atom 330 + GF9300), Kingston Data Traveler 16GB (USB 2.0) stick, KUbuntu 9.10 x64, standard kernel (2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009) + NVidia ION (Intel Atom 330 + GF9300, Asus AT3N7A-1), Kingston Data Traveler 16GB (USB 2.0) stick, KUbuntu 9.10 x64, standard kernel (2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009)
-- KUbuntu installation on USB has very poor performance since 9.10 https://bugs.launchpad.net/bugs/468978 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
