Roundtable April 2010

roundtable@muug.ca

15 participants
17 discussions

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Re: [RndTbl] squid caching of Windblows Updates
by Adam Thompson 15 Apr '10

15 Apr '10

IIRC the DHCP option works for OS X.

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Network performance tuning
by Kevin McGregor 15 Apr '10

15 Apr '10

I've been trying to narrow down where my performance bottleneck(s) is (are). I just ran "iperf" from a Windows PC (XP SP3) to my Ubuntu 9.10 server. With iperf in "server" mode on the PC, and the client running on the Ubuntu machine, I get 0.0-60.0 sec 4.23 GBytes 606 Mbits/sec Reversed (iperf "server" running on Ubuntu server, client running on the PC), I get 0.0-60.0 sec 1.13 GBytes 162 Mbits/sec Wha...?? Both client and server runs on the PC report TCP window size to be 8 KB, but the Linux client reports 22.4 KB and the Linux server reports 85.3 KB. Increasing that to 256K on both ends has little effect. Does anyone have any suggestions? The Windows NIC is a Realtek RTL8169/8110 Family Gigabit Ethernet; the Ubuntu server is using the Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01). Time to replace a NIC or two? Kevin

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Multiple simultaneous SSH connections
by Gilbert E. Detillieux 14 Apr '10

14 Apr '10

At last night's meeting, during the round-table discussion, someone asked about setting up simultaneous SSH connections to multiple host sytsems. Here's the program I was thinking of... ClusterSSH: http://sourceforge.net/projects/clusterssh/ For MacOS X, there's also csshX that interfaces to the Terminal.app... csshX: http://code.google.com/p/csshx/ Adam also mentioned PSSH... http://www.theether.org/pssh/docs/0.2.3/pssh-HOWTO.html http://www.theether.org/pssh/ Both PSSH and Cluster SSH are described in the following article, along with yet another option called Multixterm... http://www.ubuntugeek.com/execute-commands-simultaneously-on-multiple-serve… Hope that helps! -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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PCIe interrupt assignments
by Kevin McGregor 07 Apr '10

07 Apr '10

I have an 8-port SATA disk controller in a PCIe slot (thanks, Trevor!), and it seems to be sharing an interrupt. I'm running Ubuntu Server 9.10 64-bit. Is there some way to arrange for it to have its own interrupt, unshared? Kevin

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MUUG Meeting, April 13, 7:30pm -- A Trio of RTFM!
by gedetil＠cs.umanitoba.ca 06 Apr '10

06 Apr '10

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, April 13. The meeting topic for this month is as follows: A Trio of RTFM! Weve had a lot of positive feedback to our previous RTFM presentations, so this month, were offering you a trio of them! To start, Gilbert Detillieux will be introducing the grep family of commands (grep, egrep and fgrep) including a brief look at regular expression syntax and usage. Next up, Michael Doob will present the sed command, showing you how to take regular expressions a little further. Finally, Mark Jenkins will present the smartctl command, for monitoring hard disk status and health. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15pm, so the meeting can start promptly at 7:30pm. Don't be late, or you may not get in. (But don't come too early either, since security may not be there to let you in before 7:15 or so.) Non-members may be required to show photo ID at the security desk. Limited parking is available for free on the street, either on Ellice Ave. or on some of the intersecting streets. Indoor parking is also available nearby, at Portage Place, for $5.00 for the evening. Bicycle parking is available in a bike rack under video surveillance located behind the building on Webb Place. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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Potentially long cron jobs
by Kevin McGregor 01 Apr '10

01 Apr '10

I want to run something via cron which will take anywhere from less than a minute to a day or so (possibly). Most of the time it will be well under an hour, and I'd like it to run hourly, except if it's still running, in which case nothing more need be done. What the best way to do that? Kevin

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WARNING - RndTbl reply-to setting changed
by athompso＠muug.mb.ca 01 Apr '10

01 Apr '10

After a number of complaints (including some from me!) we've changed the default setting for Replies on the roundtable(a)muug.mb.ca (RndTbl) mailing list. When you replied to a message on the list previously, the default was to send replies only to the original sender, bypassing the mailing list. To reply to the list members at large, you probably would have had to use your email client's Reply-to-All function. NOW, when you reply to a message on the list, the default will be to send the reply TO THE ENTIRE LIST. This means the *potential* exists to send embarrassing messages to a much larger audience than intended - so the usual rule applies doubly: if you don't want everyone to see what you're writing, don't put it in an email. And if you do anyway, double-check the To: address before you hit send. We're all more technically-oriented than the "average user", so I'm hoping there won't be very many (if any) ohnosecond[1] moments. Thank you, -Adam Thompson <athompso(a)muug.mb.ca> [1] http://en.wiktionary.org/wiki/ohnosecond

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Roundtable April 2010