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From: Shaun Reitan <mailinglists@unix-scripts.com>
To: xen-devel@lists.xensource.com
Cc: xen-users@lists.xensource.com
Subject: Re: VM disk I/O limit patch
Date: Thu, 23 Jun 2011 13:45:36 -0700	[thread overview]
Message-ID: <iu08lj$l0u$1@dough.gmane.org> (raw)
In-Reply-To: <20110621162935.F4A1.3A8D29D5@cloudex.cn>

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

  parent reply	other threads:[~2011-06-23 20:45 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-21  8:29 VM disk I/O limit patch Andrew Xu
2011-06-21 13:33 ` Konrad Rzeszutek Wilk
2011-06-22 12:06   ` [Xen-users] " Andrew Xu
2011-06-22 13:11     ` Konrad Rzeszutek Wilk
2011-06-22 14:12       ` Re[2]: " Andrew Xu
2011-06-22 14:39         ` Konrad Rzeszutek Wilk
2011-06-24 14:29         ` Re[2]: " Ian Jackson
2011-06-22 12:16   ` Re: [Xen-devel] " Florian Heigl
2011-06-22 13:07     ` [Xen-users] " Konrad Rzeszutek Wilk
2011-06-23 20:45 ` Shaun Reitan [this message]
2011-06-27 15:41   ` Konrad Rzeszutek Wilk
2011-06-27 19:22     ` Shaun Reitan
2011-06-28 11:32     ` Re: [Xen-devel] " Florian Heigl
2011-06-28 13:29       ` [Xen-users] " Konrad Rzeszutek Wilk

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