Another happy user experience: I started packaging bcache-tools for 
Fedora 20 summer 2013, just because I wanted to use bcache. After 
alligning bcache-tools with util-linux, Dracut and LVM2 (all these 
packages needed minor tweaks, that were all integrated upstream) I have 
been using bcache myself (of course). I've been living on the edge by 
using writeback caching and a cheap SSD, and it has all been working 
like a charm! Well, I've been living over the edge actually by 
attempting to enable TRIM - I blame the resulting corruptions on the 
cheap SSD. And I had occasional "bcache_writeback 100% CPU" issues, but 
those seem to be gone (currently kernel 3.16).

And searching for bcache at bugzilla.redhat.com: no bugs pop up. Could 
be that there are no bcache users at all, but I know for fact that 
that's not true.

So (when not using TRIM): excellent performance and stability. Thanks 
for the good work!

Rolf

On 11/06/2014 04:03 PM, Zachary Palmer wrote:

If I can throw mine in as well, I've been running bcache on my Debian 
Wheezy laptop for around a year now.  (I'm using the Debian backports 
3.12 kernel.)  When I first moved to bcache, I noticed that certain 
operations -- interacting with Git repositories and building LaTeX 
documents, for instance -- became much snappier. I'm using a feeble 
little 32GB SSD that came with the laptop to cache a 1TB drive and I'm 
even using writethrough caching (more out of paranoia about the 
quality of my cheap little SSD than anything else), but it makes a 
difference.

Since then, it has been quietly humming along and I've stopped paying 
attention to it.  And that's the beauty of a good tool like this: I 
can stop paying attention to it.  I've enjoyed a year of better I/O 
and, other than in the initial setup, I haven't paid anything in 
maintenance burden: no instability, no hiccups, no unexplained hangs.  
So for my part as an end user just trying to get a little edge out of 
my laptop hardware, thank you!  I expect I'm speaking on behalf of 
quite a few people when I say that you've made things better in a 
subtle but significant way.  :)

Cheers,

Zach