On Thu, Jul 28, 2011 at 04:28:04PM -0400, Chris Mason wrote: > The slow performance is probably coming from reading in the metadata > associated with the snapshot extents. The new readahead extentions from > Arne should help once we've adapted them to it. The easiest way to make > sure is to hit sysrq-w a few times while it is slow (or run a patched > latencytop). We shut down the rsync backups for now, and are waiting for the snapshots to complete deletion so we can unmount the filesystem to reboot (missing kernel options for latencytop). In the mean time I hit SysRq-W quite a number of times, and nothing is showing up in kernel messages. However, btrfs-cleaner and/or btrfs-transaction (sometimes both, sometimes just one) have been running high in top, taking up all the CPU time. -- Bruce Guenter <bruce@xxxxxxxxxxxxxx> http://untroubled.org/
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