Re: [linux-audio-user] Linux for live performance

Hallo, Lee Revell hat gesagt: // Lee Revell wrote: I found this, which mentions the System Management Mode (SMM) as well as a source of realtime problems: http://msdn.microsoft.com/library/en-us/dnxpembed/html/hardrealtime.asp?fra… The subchapter "Hardware causes of ISR latency" says this: Power management, especially on portable devices, creates occasional long-latency events when the CPU is put in a low-power-consumption state after a period of inactivity. Such problems are usually quite easy to detect. A typical system can disable those features via BIOS setup. Some systems, again typically notebooks, use the Pentium processor's System Management Mode (SMM) to perform specialized keystroke or other processing in BIOS firmware. While in SMM, the processor does not field interrupts that adds to ISR latencies. Fortunately new generations of system platforms, starting with ACPI platforms and Windows 2000, use the operating system and not BIOS, to provide power management. As a result, these sources of latency are now minimal. The last paragraph indicates that there might be hope. Ciao -- Frank Barknecht _ ______footils.org_ __goto10.org__