KCLUG April 2005

kclug@kclug.org

53 participants
144 discussions

RE: creating controlled latency/jitter
by Kelsay, Brian - Kansas City, MO 26 Apr '05

26 Apr '05

You could always plug a box fan in near your Cat5 cable. The mag field will F up the signal. Or maybe a space heater. Worked for a couple of PCs I had to fix. People couldn't believe that you shouldn't have these surging devices near a PC. >-----Original Message----- >From: kclug-bounces(a)kclug.org [mailto:kclug-bounces@kclug.org] >On Behalf Of crash3m >Sent: Monday, April 25, 2005 6:43 PM >To: kclug(a)kclug.org >Subject: creating controlled latency/jitter > > >I need to test some real time traffic, but I need to create some >'interference' to simulate a flaky internet connection. I am trying >to create controlled latency so that I can determine at which point >latency (and jitter) becomes a big problem. Would this be a job for >QoS?

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database
by Tim reid 26 Apr '05

26 Apr '05

I'm thinking of programing/writing/whatever a database to keep track of some information for work. I think that I would like to keep track of 7-12 fields of information, and be able to set up reminders that are tagged to date information. For instance, "you did such and such 30 days ago...you can now file the claim, here is the information that you recorded earlier." How would i go about doing this, free as in beer, in an open database format? Let me also mention that I'm a total newb ;) TIA, Tim

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RE: Linux Certification
by Kelsay, Brian - Kansas City, MO 26 Apr '05

26 Apr '05

>-----Original Message----- >--- Jack <quiet_celt(a)yahoo.com> wrote: >> --- Leo Mauler wrote: >> > Don't know much about this being a good way to >> find >> > out about prospective employees. Some of us are >> > very >> > good at bluffing: about four years ago I had never >> > touched Microsoft Excel, and yet I scored 88% on >> the >> > test for it for some temp agency. >> > >> If you scored 88% on a programming test, I certainly >> wouldn't hire you. That would mean that someone >> would >> have to fix more than 10% of your code. Not an >> exciting >> prospect. But I was actually referring to tests that >> I >> would create using test building software that comes >> But a test like this on Excel tests whether you know some shortcut key combos or do you only click on the little pictures. If you know key combos like Ctl+x for cut, then you will be faster and more productive. A test like that also marks you down if you try to search thru the drop-down menus like File, Edit, and Tools. You only get a score for the task if you pull down the RIGHT menu on the first try. If someone got 100% on this test, I'd assume they can write their own macros to complete tasks and can remember exactly how to do mail-merge in whatever version of Office. MS tends to change how to mail-merge from version to version or move it around in the menus.

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RE: Linux Certification
by Leo Mauler 26 Apr '05

26 Apr '05

Ouch, I thought the RHCT was only $256, I'm taking a class for that one and the instructor (at JCCC) says its only $256 for the RHCT. Obviously the RHCE is a lot more expensive. --- Brad <brad(a)bradandkim.net> wrote: > On Thu, 2005-04-21 at 10:02 -0700, Leo Mauler wrote: > > but you can still > > get that RHCE/RHCT cert for less than $300. > > It is actually $749 to sit for the RHCE exam. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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RE: creating controlled latency/jitter
by Garrett Goebel 26 Apr '05

26 Apr '05

Gerald Combs wrote: > > crash3m wrote: > > > I need to test some real time traffic, but I need to create some > > 'interference' to simulate a flaky internet connection. I am trying > > to create controlled latency so that I can determine at which point > > latency (and jitter) becomes a big problem. Would this be a job for > > QoS? > > If you need to simulate flakiness at layer 2 you might be able to use > FreeBSD's dummynet(4) driver. Dunno if there's an equivalent Netfilter > module for Linux. We've used dummynet here at work. It works well. You can control bandwidth, latency, packet loss, multiple paths... Here's a short tutorial: http://cs.ecs.baylor.edu/~donahoo/tools/dummy/tutorial.htm And it's author's page: http://info.iet.unipi.it/~luigi/ip_dummynet/ I spent a long time looking for an equivalent linux solution. There used to be something that could be made to introduce latency using ethertap and a 2.2 kernel. But I was otherwise unable to find a way to simulate delay using linux. If anyone knows of anything, please let me know. cheers, Garrett -- Garrett Goebel IS Development Specialist ScriptPro Direct: 913.403.5261 5828 Reeds Road Main: 913.384.1008 Mission, KS 66202 Fax: 913.384.2180 www.scriptpro.com garrett at scriptpro dot com

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RE: Linux Certification
by Leo Mauler 26 Apr '05

26 Apr '05

--- Jack <quiet_celt(a)yahoo.com> wrote: > --- Leo Mauler wrote: > > Don't know much about this being a good way to > > find out about prospective employees. Some of > > us are very good at bluffing: about four years > > ago I had never touched Microsoft Excel, and > > yet I scored 88% on the test for it for some > > temp agency. > > If you scored 88% on a programming test, I > certainly wouldn't hire you. That would mean that > someone would have to fix more than 10% of your > code. Not an exciting prospect. I only mentioned it because at the time, I actually scored higher than most of their applicants (who may well have been bluffing, poorly, as well). Naturally a hands-on programming test would be much more difficult. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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RE: Linux Certification
by Leo Mauler 26 Apr '05

26 Apr '05

Which testing packages were you going to use? I haven't explored that area of Linux distro packaging. --- Jack <quiet_celt(a)yahoo.com> wrote: > --- Leo Mauler wrote: > > Don't know much about this being a good way to > find > > out about prospective employees. Some of us are > > very > > good at bluffing: about four years ago I had never > > touched Microsoft Excel, and yet I scored 88% on > the > > test for it for some temp agency. > > > If you scored 88% on a programming test, I certainly > wouldn't hire you. That would mean that someone > would > have to fix more than 10% of your code. Not an > exciting > prospect. But I was actually referring to tests that > I > would create using test building software that comes > > free with Linux. I think tests should be created > specifically for the needs of the company doing > the hiring. I haven't been to any of the "prove it" > test sites. Certainly, they are no magic bullet. But > a > > certificate only says you studied some book, or took > a > course and then took a test and can be relied upon > to > perform any task identical to the test. > > Of course the performance tests are better than > this. > > Multiple choice tests are the worst measure. > > > Brian D. > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam > protection around > http://mail.yahoo.com > _______________________________________________ > Kclug mailing list > Kclug(a)kclug.org > http://kclug.org/mailman/listinfo/kclug > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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RE: Screen Resolution Trends
by Leo Mauler 26 Apr '05

26 Apr '05

You should consider a second monitor. XFree86 has the option "Xinerama" for extending your screen onto two or more monitors. You don't need a two or more "head" video card, just a second or third PCI video card plugged into your home system. I've extended my 1024x768 17" monitor onto another 1024x768 17" monitor, and I'm considering building a shelf to add a third monitor pyramid-style. Its really handy for the multiple working windows, especially when you're doing something with GIMP and you want to move your tool windows over onto the second monitor. I'm building another machine as well and I'm looking into adding lots of monitors to it with a shelf set (try http://webgiant.sdf1.org/thriftycomputer/ for local KC thrift stores carrying sub-$10 monitors for that extra monitor). --- "Kelsay, Brian - Kansas City, MO" <brian.kelsay(a)kcc.usda.gov> wrote: > >-----Original Message----- > > > > Something that's been skirted in this discussion > > is the idea that the whole point of a windowing > > environment is that no one application takes > > all of the resources - they share the screen, > > so whatever the screen's maximum resolution is, > > any given app should take _less_ than that for > > it's standard resolution. > > > > That's been something that's frustrated me. We > > have this ideal of multiple working windows, but > > unless you're on some super-pricey graphics > > workstation you're usually reduced to maximizing > > each application in turn to make the most of your > > resources. > > I have to put my home monitor on 1200x1600 so that > I can get a decent workspace w/ several apps open > at the same time and them all be usable. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Re: Linux Certification
by Leo Mauler 26 Apr '05

26 Apr '05

This /. article isn't about individual certification, but Linux Standard Base certification for distros. Or rather, the fact that distros are resisting LSB certification. --- djgoku <djgoku(a)gmail.com> wrote: > Interesting this came up on /. > > http://linux.slashdot.org/article.pl?sid=05/04/19/1836234&tid=198&tid=4&tid… __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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creating controlled latency/jitter
by crash3m 26 Apr '05

26 Apr '05

I need to test some real time traffic, but I need to create some 'interference' to simulate a flaky internet connection. I am trying to create controlled latency so that I can determine at which point latency (and jitter) becomes a big problem. Would this be a job for QoS?

2 1

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KCLUG April 2005