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Breaking News:
2010-03-10 12:00
Parallel real-time on multi-core systems with mainline Linux
Several tasks simultaneously running at real-time priority no longer interfere to each other!
2010-02-22 12:00
"Latest Stable" Linux mainline real-time 2.6.31 is out!
Kernel 2.6.31.12-rt21 is our latest and greatest
2010-02-21 12:00
OSADL at the Embedded World 2010
Industry needs Open Source - Open Source meets Industry
2010-02-09 12:00
Spinlock annotations merged from the realtime tree to Linux mainline in 2.6.33
Raw spinlocks are the "real" spinlocks now
2010-02-08 12:00
Prof Eben Moglen on "GNU GPL Version 3: The Law Making Process"
International Conference on Commons, Users, Service Providers Internet (Self-)Regulation and Copyright
2009-11-23 12:00
Added a new HOWTO to the OSADL Website: Use BuildRoot to create a Linux image for QEMU
Guest Editor Bogdan Cristea tells us about rapid prototyping of an embedded system using virtualization |
Download Latency Generator (used for calibration purposes)
Quick HOWTO
Download the file archive blocksys-0.2.tgz and type:
tar -zxvf blocksys-0.2.tgz
cd blocksys-0.2
make
modprobe blocksys
./mklatency
Check out the generated latency:
tail /var/log/messages
[..]
[..] kernel: blocksys: CPU #0 will be blocked for 2000000 nops
[..] kernel: blocksys: CPU #0 blocked about 1270 us
You may then wish to check and to calibrate latency analysis tools such as cyclictest or the OSADL Latency Measurement Box by executing mklatency while these tools are running. The CYCLES constant in the mklatency.c source file defines the duration of the latency.
File archive
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Utility mklatency and blocksys driver |
3.7 K |