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
next 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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