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From: Chris Friesen <chris.friesen-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
To: dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: blkio cgroups controller doesn't work with LVM?
Date: Wed, 24 Feb 2016 12:12:19 -0600	[thread overview]
Message-ID: <56CDF283.9010802@windriver.com> (raw)


Hi,

Are there known limitations with the blkio cgroup controller when used with LVM?

I'm using Ubuntu 15.10 with the 4.2 kernel.  I got the same results with CentOS 7.

I set up two groups, /sys/fs/cgroup/blkio/test1 and /sys/fs/cgroup/blkio/test2. 
  I set the weight for test1 to 500, and the weight for test2 to 1000.

If I then read/write to a file on /dev/sda1 from a process in each group, then 
everything works as expected and test1 gets half the bandwidth of test2.

If I do the same but accessing an LVM logical volume, where the underlying 
physical volume is /dev/sda4, then both groups get the same bandwidth.

It appears that the group weight doesn't get propagated down through all the 
layers.  Am I missing something?  If not, is this documented anywhere?

Thanks,
Chris

             reply	other threads:[~2016-02-24 18:12 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-24 18:12 Chris Friesen [this message]
     [not found] ` <56CDF283.9010802-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2016-02-25  7:48   ` blkio cgroups controller doesn't work with LVM? Nikolay Borisov
     [not found]     ` <56CEB1BC.4000005-6AxghH7DbtA@public.gmane.org>
2016-02-25 14:53       ` Mike Snitzer
     [not found]         ` <20160225145314.GA20699-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-25 15:15           ` Chris Friesen
2016-02-26 16:42           ` [dm-devel] " Vivek Goyal
     [not found]             ` <20160226164228.GA24711-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-26 16:45               ` Vivek Goyal
2016-03-02 16:06           ` Tejun Heo
     [not found]             ` <20160302160649.GB29826-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2016-03-02 17:56               ` [PATCH] block: transfer source bio's cgroup tags to clone via bio_associate_blkcg() (was: Re: blkio cgroups controller doesn't work with LVM?) Mike Snitzer
     [not found]                 ` <20160302175656.GA59991-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-03-02 18:03                   ` Nikolay Borisov
     [not found]                     ` <CAJFSNy6hni1-NWDs0z=Hq223=DfcjsNPoAb7GRAGEPCUXh4Q9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-02 18:05                       ` Mike Snitzer
2016-03-02 19:18                       ` [PATCH] " Vivek Goyal
2016-03-02 19:59                         ` Nikolay Borisov
2016-03-02 20:10                           ` Vivek Goyal
2016-03-02 20:19                             ` Nikolay Borisov
     [not found]                               ` <CAJFSNy6MUGr8E3RNw6hFiskcaG4m8EGdqMkQXVh1LGq-yZCjBg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-02 20:45                                 ` Vivek Goyal
     [not found]                             ` <20160302201016.GE3476-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-03-02 20:34                               ` [PATCH] block: transfer source bio's cgroup tags to clone via bio_associate_blkcg() Chris Friesen
     [not found]                                 ` <56D74E6A.9050708-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2016-03-02 21:04                                   ` Vivek Goyal
     [not found]                                     ` <20160302210405.GG3476-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-03-02 21:19                                       ` Vivek Goyal
2016-03-14 15:08                   ` Nikolay Borisov
     [not found]                     ` <56E6D3D3.4070104-6AxghH7DbtA@public.gmane.org>
2016-03-14 15:31                       ` Nikolay Borisov
     [not found]                         ` <56E6D95B.3030904-/eCPMmvKun9pLGFMi4vTTA@public.gmane.org>
2016-03-14 19:49                           ` Mike Snitzer
     [not found]                             ` <20160314194912.GA6975-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-03-14 22:08                               ` Nikolay Borisov

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