Re: how to debug slow rbd block device

[Stefan Priebe <s.priebe@profihost.ag>]

Am 22.05.2012 21:52, schrieb Greg Farnum:
> On Tuesday, May 22, 2012 at 12:40 PM, Stefan Priebe wrote:
> Huh. That's less than I would expect. Especially since it ought to be going through the page cache.
> What version of RBD is KVM using here?
v0.47.1

> Can you (from the KVM host) run
> "rados -p data bench seq 60 -t 1"
> "rados -p data bench seq 60 -t 16"
> and paste the final output from both?
OK here it is first with write then with seq read.

# rados -p data bench 60 write -t 1
# rados -p data bench 60 write -t 16
# rados -p data bench 60 seq -t 1
# rados -p data bench 60 seq -t 16

Output is here:
http://pastebin.com/iFy8GS7i

Thanks!

Stefan