RE: [P2PSIP] How to describe the processing power

Dear Das,

See inline.

  _____  

From: p2psip-bounces@ietf.org [mailto:p2psip-bounces@ietf.org] On Behalf Of
Das, Saumitra
Sent: Wednesday, November 12, 2008 5:12 PM
To: p2psip@ietf.org
Cc: ietf@ietf.org
Subject: Re: [P2PSIP] How to describe the processing power

Dear Song,

   Processing power would be more informational in terms of CPU load. A good
example of what would be useful would be to look at the comon monitoring
tool (http://summer.cs.princeton.edu/status/) for the planetlab testbed. It
uses the following metrics for selecting nodes based on CPU and I have found
such selection to be very useful in determining the performance of a slice
on the machine.

[Song] It is also useful in selecting peer for a neighbor table entry, when
there are multiple choices existing and for the overlay management to
collect the overall status of the overlay. 

>From the comon site, these are some metrics that may be useful

"CPU Speed
Busy CPU
Sys CPU
Free CPU
These fields give some insight into the CPU behavior of the node. The CPU
Speed is just the speed of the processor in gigahertz. The Busy CPU field
gives the % of time the CPU is utilized, and the Sys CPU field specifies
what percentage of time the CPU is spending in the OS. Both of these values
are the maximum values over the past 5 minutes. The Free CPU indicates how
much of the CPU a spin-loop was able to obtain, giving some insight into how
much of the node's CPU a new slice would receive."

We could define these fields and leave it optional as to whether all of them
are required. i.e. running a spin-loop may be expensive for some devices.

[Song] This is helpful. I'm very glad to see this monitoring tool in the
planetlab testbed. If it works well in the planet lab, we may have it
included in the diagnostics draft after discussion. I also see other useful
metrics for other parameters in the page
(http://summer.cs.princeton.edu/status/)

Best,

Saumitra

www.saumitra.info

Date: Tue, 11 Nov 2008 15:12:21 +0800

From: Song Haibin <melodysong@huawei.com>

Subject: [P2PSIP] How to describe the processing power

To: p2psip@ietf.org

Message-ID: <003e01c943cc$d6e2b1a0$0c0ca40a@china.huawei.com>

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Dear all,

In p2psip diagnostics draft

http://tools.ietf.org/id/draft-zheng-p2psip-diagnose-03.txt

, we have some doubt about how to describe one of the diagnostic

information: processing power. We propose to use the unit of MIPS to
describe it. However, the Max number of connections may be another choice.

Do you have any good suggestions?

Best Regards,

Song Haibin

Email: melodysong@huawei.com

Skype: alexsonghw