August 1, 2005 6:04 PM PDT
MontaVista beats real-time Linux deadline
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The company is working on building "hard real-time" support in Linux, which guarantees that the operating system will respond within a short, fixed amount of time to high-priority interruptions. The feature, typically only found in specialized operating systems, is useful in machines such as precisely controlled factory robots or computing gear that handles network packets.
To meet real-time requirements, an operating system must have a short response time, called latency. MontaVista's work, which also includes outside Linux programmers, has achieved latency of 98 microseconds, or millionths of a second. That's about 100 times better than version 2.6.10 of the standard Linux kernel, according to the company.
The real-time changes will be incorporated into MontaVista's future Linux product for telecommunications equipment, the company said.
There's still work to do, however. "We are not all the way down there," with the faster response time required by something like a smart bomb or a car's antilock braking system, Ulander said.
Linux's average time, as measured with various speed tests, ranged from 16 to 34 microseconds, Ulander said. Real-time operating systems such as Mentor Graphics' VRTX--developed in part by MontaVista founder Jim Ready--and Wind River's VxWorks--have average latencies in the 8 to 13 microsecond range.
Wind River had shunned Linux for years but now has an active program to embrace the open-source operating system as an alternative to VxWorks.
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