Messages in this thread | | | Date | Tue, 20 Sep 2011 16:39:38 +0530 | From | Kamalesh Babulal <> | Subject | Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede |
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* Venki Pallipadi <venki@google.com> [2011-09-19 17:38:26]:
> On Mon, Sep 19, 2011 at 10:51 AM, Kamalesh Babulal > <kamalesh@linux.vnet.ibm.com> wrote: > > * Peter Zijlstra <a.p.zijlstra@chello.nl> [2011-09-15 23:48:43]: > > > >> On Thu, 2011-09-15 at 23:25 +0530, Kamalesh Babulal wrote: > >> > 2.6.38 | 1551 | 48 | 62 | 47 | 50 | > >> > ----------------+-------+-------+-------+-------+-------+ > >> > 2.6.39 | 3784 | 457 | 722 | 3209 | 1037 | > >> > >> I'd say we wrecked it going from .38 to .39 and only made it worse after > >> that. > > > > after reverting the commit 866ab43efd325fae8889ea, of the patches > > went between .38 and .39 reduces the ping pong of the tasks. > > There was a side-effect from 866ab43efd325fae8889ea that Ken > identified and fixed later in commit > b0432d8f162c7d5d9537b4cb749d44076b76a783. I guess you are seeing the > same problem... (snip)
3.1-rc4+tip includes the commit b0432d8f162c7d5d. The number of task ping pongs has reduced with 3.1-rc4+tip, in comparison to 2.6.39 as seen in the below table. Reverting the commit 866ab43efd325fa on the 3.1-rc4+tip reduces the task bouncing to a good extend.
> > ------------------------+-------+-------+-------+-------+-------+ > > Kernel | Run 1 | Run 2 | Run 3 | Run 4 | Run 5 | > > ------------------------+-------+-------+-------+-------+-------+ > > 2.6.39 | 1542 | 2172 | 2727 | 120 | 3681 | > > ------------------------+-------+-------+-------+-------+-------+ > > 2.6.39 (with | | | | | | > > 866ab43efd reverted) | 65 | 78 | 58 | 99 | 62 | > > ------------------------+-------+-------+-------+-------+-------+ > > 3.1-rc4+tip | | | | | | > > (e467f18f945c) | 1219 | 2037 | 1943 | 772 | 1701 | > > ------------------------+-------+-------+-------+-------+-------+ > > 3.1-rc4+tip (e467f18f9) | | | | | | > > (866ab43efd reverted) | 64 | 45 | 59 | 59 | 69 | > > ------------------------+-------+-------+-------+-------+-------+ > >
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