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    SubjectRe: [PATCH -mmotm 0/5] memcg: per cgroup dirty limit (v7)
    * Vivek Goyal <vgoyal@redhat.com> [2010-03-17 09:34:07]:

    > On Wed, Mar 17, 2010 at 05:24:28PM +0530, Balbir Singh wrote:
    > > * Vivek Goyal <vgoyal@redhat.com> [2010-03-15 13:19:21]:
    > >
    > > > On Mon, Mar 15, 2010 at 01:12:09PM -0400, Vivek Goyal wrote:
    > > > > On Mon, Mar 15, 2010 at 12:26:37AM +0100, Andrea Righi wrote:
    > > > > > Control the maximum amount of dirty pages a cgroup can have at any given time.
    > > > > >
    > > > > > Per cgroup dirty limit is like fixing the max amount of dirty (hard to reclaim)
    > > > > > page cache used by any cgroup. So, in case of multiple cgroup writers, they
    > > > > > will not be able to consume more than their designated share of dirty pages and
    > > > > > will be forced to perform write-out if they cross that limit.
    > > > > >
    > > > >
    > > > > For me even with this version I see that group with 100M limit is getting
    > > > > much more BW.
    > > > >
    > > > > root cgroup
    > > > > ==========
    > > > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M
    > > > > 4294967296 bytes (4.3 GB) copied, 55.7979 s, 77.0 MB/s
    > > > >
    > > > > real 0m56.209s
    > > > >
    > > > > test1 cgroup with memory limit of 100M
    > > > > ======================================
    > > > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M
    > > > > 4294967296 bytes (4.3 GB) copied, 20.9252 s, 205 MB/s
    > > > >
    > > > > real 0m21.096s
    > > > >
    > > > > Note, these two jobs are not running in parallel. These are running one
    > > > > after the other.
    > > > >
    > > >

    The data is not always repeatable at my end. Are you able to modify
    the order and get repeatable results?

    In fact, I saw

    for cgroup != root
    ------------------
    4294967296 bytes (4.3 GB) copied, 120.359 s, 35.7 MB/s

    for cgroup = root
    -----------------
    4294967296 bytes (4.3 GB) copied, 84.504 s, 50.8 MB/s

    This is without the patches applied.


    --
    Three Cheers,
    Balbir


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