[Xen-devel] Re: VM disk I/O limit patch

[Shaun Reitan <mailinglists@xxxxxxxxxxxxxxxx>]

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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