[dm-devel] dm-thin vs lvm performance
Joe Thornber
thornber at redhat.com
Fri Jan 20 17:33:34 UTC 2012
On Fri, Jan 20, 2012 at 05:03:35PM +0000, Joe Thornber wrote:
> For me, the first run of aio_stress manages a throughput of ~9G/s.
> After the wipe, which is just a simple dd across the device,
> performance drops to ~5.5 G/s. Also throughput on the device under
> the linear target also drops. Permanently.
>
> I don't know if this is specific to aio, or a more general slowdown.
It's just me being stupid. For the initial pass the ramdisk has no
memory backing it and is just returning zeroes.
Back to testing ...
- Joe
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