I have been able to reproduce this bug using bonnie++. The process I used was to install Oneiric using the netboot installer to an external USB SATA drive and boot with that as my root filesystem (SD only has bootloaders & kernel).
Steps to reproduce on a running system: On panda (no ping): sudo apt-get install bonnie++ bonnie++ -n 0 -m "USB HD" -q 1>>bonnie.csv After this runs, on a different system on the same network, start "sudo ping -i 0.001 panda" (assuming the panda is in the host lookup), then on the panda run: bonnie++ -n 0 -m "USB HD with ping" -q 1>>bonnie.csv This will produce the results attached (bonnie.csv). Bonnie.html is an html formatted version of the output (with non-run tests removed). ** Attachment added: "bonnie.html" https://bugs.launchpad.net/ubuntu/+source/linux-ti-omap4/+bug/709245/+attachment/2218631/+files/bonnie.html -- You received this bug notification because you are a member of Linaro Release Team, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/709245 Title: panda: USB disk IO slow Status in Linaro Linux: Confirmed Status in “linux-ti-omap4” package in Ubuntu: Confirmed Bug description: My Panda's USB seems to be significantly slower than a Beagle C4. hdparm shows buffered reads as ~12MB/s on the Panda, and about ~20-25MB/s on a Beagle C4 from the same external Lacie USB disk. Kernel is 2.6.37-1002-linaro-omap Disk shows as: [ 5.170440] scsi 0:0:0:0: Direct-Access LaCie d2 quadra PQ: 0 ANSI: 4 [ 5.172546] sd 0:0:0:0: Attached scsi generic sg0 type 0 [ 5.175415] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/465 GiB) The board is otherwise idle during the test. Doing perf_2.6.37-12 record -a dd if=/dev/sda of=/dev/null bs=4096 count=100000 shows : 81.41% swapper [kernel.kallsyms] [k] default_idle 6.33% dd [kernel.kallsyms] [k] __copy_to_user 0.94% swapper [kernel.kallsyms] [k] cpu_idle 0.51% dd [kernel.kallsyms] [k] __make_request 0.51% perf_2.6.37-12 [kernel.kallsyms] [k] __copy_from_user which suggests it's not CPU constrained. Dave To manage notifications about this bug go to: https://bugs.launchpad.net/linux-linaro/+bug/709245/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~linaro-release Post to : [email protected] Unsubscribe : https://launchpad.net/~linaro-release More help : https://help.launchpad.net/ListHelp
