Hi
I am trying to install NISTNet on Ubuntu and i saw that you have
provided a webpage to get the patch. But that page is not opening, i
have problems copying the patch...I get an error " Cannot open data
connection"
Can you help me
Thank You
Sriram
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Today's Topics:
1. nistnet on linux-2.6.23 (Ernst van der Plas)
2. Re: [Help] - NISTNET occupy lots of soft interrupts while
traffic up (Ernst van der Plas)
----------------------------------------------------------------------
Message: 1
Date: Tue, 04 Dec 2007 12:18:52 +0100
From: Ernst van der Plas <[EMAIL PROTECTED]>
Subject: [nistnet] nistnet on linux-2.6.23
To: nistnet@antd.nist.gov
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi List,
recently Gabriel got NistNet working on a 2.6.23 kernel with the
patches I provided. I made the patch and the information I gave him
available on a web site. Maybe they are of use to someone else as well.
http://www.aimvalley.com/ site and folow the Open Source link.
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Message: 2
Date: Tue, 04 Dec 2007 12:26:02 +0100
From: Ernst van der Plas <[EMAIL PROTECTED]>
Subject: Re: [nistnet] [Help] - NISTNET occupy lots of soft interrupts
while traffic up
To: [EMAIL PROTECTED]
Cc: nistnet@antd.nist.gov, [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=UTF-8; format=flowed
Stephen
I have no experience with irq balance. I do remember to have seen
though, that with a certain level of interrupt the irq's are divided
between the 2 cores of a dual core machine. Which again intruduces a
greater variance in inter packet delay.
I dont know about the engineering limit of NistNet.
Ernst
[EMAIL PROTECTED] wrote:
Hi Ernst
Thanks for your prompt reply. I will try once I get a better
understanding of what NAPI is? And is it useful to look into IRQ balance
as well?
Another question, what is the engineering limit for NISTNet traffic?
According to the calibration result on NISTnet webpage, it could be up
to 1Gbps. However, my testing results shows that the maximum supported is
80,000 packet/sÃ512byteÃ8=320Mbps.
Thanks
Stephen
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 2007å¹´12æ4æ¥ 16:11
To: Stephen Wang
Cc: nistnet@antd.nist.gov
Subject: Re: [nistnet] [Help] - NISTNET occupy lots of soft interrupts
while traffic up
Stephen,
It could be that if youre system receives an interrupt for every packet
that is received and send. It is bound to choke at some point. You
could try to enable NAPI in the kernel. Which switches from interrupts
to polling when a certain level of interrupts is met. However you will
get some clustering of the send packets. i.e. the send inter packet
delay will vary somewhat more than with the interrupts.
Ernst
Dear NISTNET Supporter
I have been experiencing problems when testing NISTNET with Smartbit
6000C. Could you please help? Thanks in advance.
Test Platform
_____________<_____________
| eth1 | eth0
NISTNet server SmartBit 6000B
| eth2 | eth3
------------------------>----------------------
Smartbit(6000B) : 2¡Ã1000M SX fiber
NISTNET Server: 2 x 3.2GHz CPU (Dual Core), 4G RAM, 2 ¡ÃHP
NC373F PCI
Express Gigabits
Red Hat Linux Kernel: 2.6.13
NISTNET: 2.0.12c
IP£º
eth0 = 10.100.10.14/24
eth1 = 10.100.10.15/24
eth2 = 10.100.20.15/24
eth3 = 10.100.20.14/24
Test Strategy
Smartbit sends IP packet from eth0 to eth3; NISTNET server starts the IP
Forwarding; Meanwhile NISTNET injects delay.
1. Don¡¯t start NISTNET, drive through 800Mbps traffic
from eth0, on
NISTNET server, with ¡°top¡± command see that ksoftirqd/0
process takes up
almost 99% CPU, about 0.01 % packet loss are seen on
eth3,
2. Start NISTNET, inject delay,jitter cnistnet ¨Ca 10.100.10.14
10.100.20.14 add new ¨Cdelay 15 5
The traffic exceeds 350Mbps, with ¡°top¡± command we see that SI (soft
interrupt) of CPU increasing dramatically. And even the server will go
down.
Enquiry
Why NISTNET will occupy so many SI resources of CPU when traffic is up?
Any ideas to improve?
Thanks
Stephen
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