On Sun, 9 Dec 2012 06:17:39 +0100 (CET)
Jan Engelhardt [off-list ref] wrote:

On Sunday 2012-10-07 16:48, Martin Steigerwald wrote:

quoted

quoted

# btrfs su li /
ID 256 top level 5 path UBUNTU
ID 259 top level 5 path UBUNTU/@
ID 261 top level 5 path UBUNTU/@tmp
ID 262 top level 5 path UBUNTU/@home
[...]

This could be 100 or more subvolumes / snapshots.
Maybe slowness could be related to this one.

Absolutely. COW snapshots cause severe fragmentation (it's
in their nature).

CoW filesystem incurs fragmentation by its nature, not specifically snapshots.
Even without snapshots, rewriting portions of existing files will write the
new blocks not over the original ones, but elsewhere, thus increasing
fragmentation.

-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."