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xen-devel
[Xen-devel] Re: VM disk I/O limit patch
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 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.
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.
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 $$$
~Shaun
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