Hi, I am having ethernet performance issue on panda rev A3. TX gets stuck while RX seems fine. At least pinging is ok... I started a thread on various mailing-list (http://comments.gmane.org/gmane.linux.network/234335). I made a lot of trials but no luck so far...
My problem may be related to the one described here for usb storage. My kernel already embeds Ming Lei's patch (https://patchwork.kernel.org/patch/1113332/), and CONFIG_ARM_DMA_MEM_BUFFERABLE and CONFIG_ARCH_HAS_BARRIERS are enabled. But still ethernet performance is really poor. Smsc9514 device driver relies on usbnet. I lack usb knowledge, thus I cannot state whether Ming Lei's patch in ehci-q.c "should" fix my issue if they were related. Otherwise, did anyone find out that CONFIG_PL310_ERRATA_769419 patch above effectively fixes the usb storage issue? -- You received this bug notification because you are a member of Linaro Maintainers, which is the registrant for Linaro Linux. https://bugs.launchpad.net/bugs/709245 Title: ARM SMP scheduler performance bug Status in Linaro Ubuntu Evaluation Builds: Fix Released Status in Linaro Linux: Fix Committed Status in OEM Priority Project: Fix Released Status in OEM Priority Project maverick series: Fix Released Status in OEM Priority Project natty series: Fix Released Status in OEM Priority Project oneiric series: Fix Released Status in “linux-ti-omap4” package in Ubuntu: Fix Released Status in “linux-ti-omap4” source package in Maverick: Fix Released Status in “linux-ti-omap4” source package in Natty: Fix Released Status in “linux-ti-omap4” source package in Oneiric: Fix Released Bug description: Original Bug name: "panda: USB disk IO slow" This bug effects ARM Cortex A9 cores, snowball, nvidia, OMAP 4, and other Cortex A9 processors. Problem is in Fedora ARM builds also so not limited to Ubuntu. 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/linaro-ubuntu/+bug/709245/+subscriptions -- Mailing list: https://launchpad.net/~linaro-pkg Post to : [email protected] Unsubscribe : https://launchpad.net/~linaro-pkg More help : https://help.launchpad.net/ListHelp
