The day after the openSUSE conference, Jos showed me his laptop and a
problem with it under the most recent Tumbleweed kernel (and older
kernels as well.)
He is copying a very large (3Gb) file to his btrfs partition from a USB
external drive (running ext3) such that if it succeeds, the partition
will almost be full (only a few Mb left). This should be fine, but it
almost kills the system, slowing responsiveness down to nothing being
possible to do at all on the box until the copy completes 15+ minutes
later. It is possible to eventually interrupt the copy, and when that
happens, the system returns back to life.
Copying the other way (from the btrfs partition to the USB disk), works
absolutly fine, so it doesn't seem like the system is hurting from
memory pressure on anything else.
Is this a currently-known issue on btrfs when the filesystem is almost
out of space and it just takes forever to find empty blocks in which to
put things, or is it something that we should log in a bugzilla entry
and try to get resolved?
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