From: Bharata B Rao <bharata@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: balbir@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
Dhaval Giani <dhaval@linux.vnet.ibm.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Pavel Emelyanov <xemul@openvz.org>,
kvm@vger.kernel.org,
Linux Containers <containers@lists.linux-foundation.org>,
Herbert Poetzl <herbert@13thfloor.at>
Subject: Re: [RFC] CPU hard limits
Date: Fri, 5 Jun 2009 12:02:43 +0530 [thread overview]
Message-ID: <20090605063243.GC3872@in.ibm.com> (raw)
In-Reply-To: <4A28B539.3050001@redhat.com>
On Fri, Jun 05, 2009 at 09:03:37AM +0300, Avi Kivity wrote:
> Balbir Singh wrote:
>>> I think so. Given guarantees G1..Gn (0 <= Gi <= 1; sum(Gi) <= 1),
>>> and a cpu hog running in each group, how would the algorithm divide
>>> resources?
>>>
>>>
>>
>> As per the matrix calculation, but as soon as we reach an idle point,
>> we redistribute the b/w and start a new quantum so to speak, where all
>> groups are charged up to their hard limits.
>>
>> For your question, if there is a CPU hog running, it would be as per
>> the matrix calculation, since the system has no idle point during the
>> bandwidth period.
>>
>
> So the groups with guarantees get a priority boost. That's not a good
> side effect.
That happens only in the presence of idle cycles when other groups [with or
without guarantees] have nothing useful to do. So how would that matter
since there is nothing else to run anyway ?
Regards,
Bharata.
next prev parent reply other threads:[~2009-06-05 6:32 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-04 5:36 [RFC] CPU hard limits Bharata B Rao
2009-06-04 12:19 ` Avi Kivity
2009-06-04 21:32 ` Mike Waychison
2009-06-05 3:03 ` Bharata B Rao
2009-06-05 3:33 ` Avi Kivity
2009-06-05 4:37 ` Balbir Singh
2009-06-05 4:44 ` Avi Kivity
2009-06-05 4:49 ` Balbir Singh
2009-06-05 5:09 ` Chris Friesen
2009-06-05 5:13 ` Balbir Singh
2009-06-05 5:10 ` Balbir Singh
2009-06-05 5:21 ` Avi Kivity
2009-06-05 5:27 ` Balbir Singh
2009-06-05 5:31 ` Bharata B Rao
2009-06-05 6:01 ` Avi Kivity
[not found] ` <4A28B4CE.4010004-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-06-05 8:16 ` Bharata B Rao
2009-06-07 6:04 ` Avi Kivity
2009-06-07 16:14 ` Bharata B Rao
2009-06-05 9:39 ` Balbir Singh
2009-06-05 13:14 ` Avi Kivity
[not found] ` <4A291A2F.3090201-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-06-05 13:42 ` Balbir Singh
2009-06-07 6:09 ` Avi Kivity
2009-06-05 14:54 ` Chris Friesen
2009-06-07 6:10 ` Avi Kivity
2009-06-05 9:24 ` Balbir Singh
2009-06-05 6:03 ` Avi Kivity
2009-06-05 6:32 ` Bharata B Rao [this message]
2009-06-05 12:57 ` Avi Kivity
2009-06-05 5:16 ` Avi Kivity
2009-06-05 5:20 ` Balbir Singh
2009-06-05 3:07 ` Balbir Singh
2009-06-05 8:53 ` Paul Menage
2009-06-05 9:27 ` Bharata B Rao
2009-06-05 9:32 ` Paul Menage
2009-06-05 9:48 ` Dhaval Giani
2009-06-05 9:51 ` Paul Menage
2009-06-05 9:59 ` Dhaval Giani
2009-06-05 10:03 ` Paul Menage
2009-06-08 8:50 ` Pavel Emelyanov
2009-06-05 9:36 ` Balbir Singh
[not found] ` <20090605093625.GI11755-SINUvgVNF2CyUtPGxGje5AC/G2K4zDHf@public.gmane.org>
2009-06-05 9:48 ` Paul Menage
2009-06-05 9:55 ` Balbir Singh
2009-06-05 9:57 ` Paul Menage
2009-06-05 10:02 ` Paul Menage
2009-06-05 11:32 ` Srivatsa Vaddagiri
2009-06-05 12:18 ` Paul Menage
[not found] ` <6599ad830906050518t6cd7d477h36a187f2eaf55578-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-06-07 10:11 ` Srivatsa Vaddagiri
2009-06-07 15:35 ` Balbir Singh
2009-06-08 4:37 ` Srivatsa Vaddagiri
2009-06-05 14:44 ` Chris Friesen
2009-06-05 13:02 ` Avi Kivity
2009-06-05 13:43 ` Dhaval Giani
2009-06-05 14:45 ` Chris Friesen
2009-06-05 9:02 ` Reinhard Tartler
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