Hi. I am running ubuntu on BBB and I have an external HDD attached over USB.
I am having trouble reading large files on the external disks over sftp and ftp. I tried different ftp clients but the result is the same. After reading some of the file, typically a few GB, the cpu uses 100% CPU and the speed drops to practically nothing. I believe I have traced the problem to be an issue of reading from the disk. If I make a large file: dd if=/dev/zero of=file.txt count=1024 bs=4000000 (which is not a problem apparently) and then read it using time sh -c "dd if=file.txt bs=4k" It will in a few minutes jump to use 100% CPU and in many instances crash the ssh session with: "The client has disconnected from the server. Reason: Message Authentication Code did not verify (packet #222795). Data integrity has been compromised. " I found some discussion (https://bbs.archlinux.org/viewtopic.php?id=112846&p=4) of what seems to be a similar issue where they suggest to set /sys/kernel/mm/transparent_hugepage/defrag to madvise. But I don't know how to try that on the BBB or if it is even relevant. Any idea about how to resolve this nasty problem? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
