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Displaying posts with tag: Linux kernel (reset)

Serious XFS Performance Regression in Linux Kernel 2.6.32-279
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I'm not the only one to have noticed this, but I spent a sufficient amount of time banging my head against a wall finding this out that I thought it important to make more people aware of this.

While trying to validate new database hardware we were seeing some serious performance issues in production.  Most MySQL benchmarks using sysbench or pt-playback couldn't reproduce it, but a simple sysbench 16 threaded filio test on the mysql partition showed about 1/3 the throughput we would expect.   The fact that much of the hardware was new as well as the OS we were using made tracking down the cause difficult (changing from CentOS 5.5 to Scientific Linux 6.)

Finally some of our ops people working on different systems started noticing similar issues, and they uncovered the XFS issue.  Sure enough -- when took existing hardware,



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CAOS Theory Podcast 2010.12.10
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Topics for this podcast:

*Oracle, Java, the Apache Software Foundation and open source
*An update on some open source database and data management players
*CorraTech grows with support for open source application alternatives
*Red Hat-Makara acquisition analysis and impact
*Linux kernel report shows strong support, but what now for Novell?

iTunes or direct download (29:31, 5.1MB)

Security Updates | 2010-02-16
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I track security updates for the following vendors: Apple, Cisco, FreeBSD, Microsoft, Red Hat, and Sun Microsystems. I chose these vendors based on my own needs for the networks and systems I manage. I've also found that updates from these vendors tend to catch the major updates necessary for common software applications. If you have other vendors you would like me to provide updates for, send me a message.

If you have an interest in information security from both a technical and managerial level, check out Principles of Information Security. It does an excellent job of presenting material for both audiences.


Red Hat, Inc.


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On the importance of copyright assignment
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Some weeks ago Luke Kaines stated his observation that “requiring copyright attribution is a greater sin than providing commercial add-ons”.

His perspective was based on the theory that requiring copyright assignment restricts the developer community, a theory that was apparently repeated by Dave Neary during the recent OSBC event (I missed that session due to our CAOS client lunch).

Daniel Chalef of KnowledgeTree provided some evidence of Dave’s perspective and also the contrary view that the assignment of copyright is critical not just for vendor-dominated projects but also for community projects such as The

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451 CAOS Links 2009.03.20
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IBM to acquire Sun? TomTom countersues Microsoft. Sun unveils Open Cloud Platform. Oracle’s contributions to the Linux kernel. SpringSource updates Tool Suite. And more.

Follow 451 CAOS Links live @caostheory

IBM to acquire Sun?

No prizes for guessing the big story this week as the Wall Street Journal reported that IBM was in talks to buy Sun for $6.5bn, according to “people familiar with the matter”. Raising the game, the New York Times reported that the purchase price was nearer $7bn citing “a person with knowledge of the negotiations”.

The media exploded with




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Showing entries 1 to 5

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