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xen-users
Re: [Xen-devel] Re: VM disk I/O limit patch
On Thu, Jun 23, 2011 at 01:45:36PM -0700, Shaun Reitan wrote:
> Does this match only limit throughput or can it also limit the guest
> by disk IOPS? christopher aker had a patch way back for UML that
Just throughpout.
> did disk based qos. What i really liked about that patch was that
> it allowed for bursting by using a bucket. If i remember correctly
> you specified that a guest's bucket could hold say 4000 tokens, and
> the bucket would be filled with 10 tokens a second. Each IO took
> one token from the bucket. When the bucket was empty IO was paused
> and processed as the bucket was filled. This allowed a guest to
> burst for a short period of time until that bucket was empty and
> then it would slowely be filled back up.
Uhhh... are you sure you are talking about the same patch.
>
> Also what was nice is that the guest had a /proc/ entry that told
> the customer how many tokens they currently had in their bucket.
OK.. but how would this help the customers? They don't have access
to the /proc in Dom0.
>
> I would like to see somthing like this in Xen, I've even thought
> about posting to the devel forums seeing if somebody wanted to write
> one for $$$
Why not use dm-ioband (here is a doc about it:
http://lwn.net/Articles/344441/) which has much more options and also
provide the bucket and tokens you are looking for.
[edit: Looks like dm-ioband never made it in the Linux kernel. But there
was something that I thought Vivek wrote that was superior to dm-ioband..
Ah, yes: blkio-controller.txt.
Look in Documentation/cgroups/blkio-controller.txt]
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