Satoshi UCHIDA wrote:
> Andrea's requirement is
> * to be able to set and control by absolute(direct) performance.
* improve IO performance predictability of each cgroup
(try to guarantee more precise IO performance values)
> And, he gave a advice "Can't a framework which organized each way,
> such as I/O elevator, be made?".
> I try to consider such framework (in elevator layer or block layer).
It would be probably the best place to evaluate the "cost" of each
IO operation.
> I think that OOM problems caused by memory/cache systems.
> So, it will be better that I/O controller created out of these problems
> first, although a lateness of the I/O device would be related.
> If these problem can be resolved, its technique should be applied into
> normal I/O control as well as cgroups.
>
> Buffered write I/O is also related with cache system.
> We must consider this problem as I/O control.
Agree. At least, maybe we should consider if an IO controller could be
a valid solution also for these problems.
>> I did some experiments trying to implement minimum bandwidth requirements
>> for my io-throttle controller, mapping the requirements to CFQ prio and
>> using the Satoshi's controller. But this needs additional work and
>> testing right now, so I've not posted anything yet, just informed
>> Satoshi about this.
>
> I'm very interested in this results.
I'll collect some numbers and keep you informed.
-Andrea
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
