[Users] Beancounters, cgroup and writes

[Mark J.]

On Mon, Oct 28, 2013 at 11:29:05AM -0400, Simon Boulet wrote:
> Hi Mark,
> 
> On Thu, Oct 17, 2013 at 5:02 PM, Mark J. <mjohanson at a2hosting.com> wrote:
> > Noticing that the write counter is not incrementing in the beancounter file, nor is it allowing the cgroups to limit the writes either (guessing since the counter isn't changing the cgroup isn't being applied since its not seeing a change).
> >
> >
> 
> Current implementation in OpenVZ kernel only tracks synchronous
> writes. It will not track asynchronous (because the OpenVZ kernel
> doesn't have support for asynchronous page owner tracking). Reads are
> always synchronous, that's why read throttling is working. Try
> mounting the filesystem in synchronous mode and you should see blkio
> throttle working as you expect.

Thanks Simon, I will test this out on our test server.

> 
> I am not aware of any solution working under the OpenVZ kernel to do
> asynchronous write throttling. Let me know if you find something that
> does.

So far I haven't, but will let you know if I do.

> 
> Simon
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