Hello Colin, Thank you for responding. To Answer your questions: 1. I have two external drives, sdb and sdc, in USB 3 Orico enclosure. The drives are mirrored. 2. Atom D525 with 4GiB RAM. The attached screenshot shows "vmstat 5 5" output while VLC is playing a movie. It shows 1.5GiB of free memory, no swap used. 3. Screenshot also shows output from "iostat -mx", and that I manually set the spl_kmem_cache_slab_limit to zero as suggested.
I played a movie which paused repeatedly for 30 seconds and one time for several minutes. When the pause occurs, VLC is completely hung until the requested I/O completes. The end of pause is heralded by the I/O activity LED on the drive enclosure. I want to emphasize/re-iterate a couple of points from my original post: 1. This is not a VLC problem. I can recreate the problem with any app (cp, rsyn, etc) that reads sequentially from the ZFS file system. 2. I do not believe this is a drive/latency problem: I can dd the content of sdb and sdc (to /dev/null) without any hang. Regards, Colin. ** Attachment added: "spl_kmem_cache_slab_limit, vmstat, and iostat -mx" https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1725859/+attachment/5113194/+files/spl.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1725859 Title: zfs frequently hangs (up to 30 secs) during sequential read To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1725859/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
