Victor Is there a description somewhere of what the RT-Linux kernel does during the execution of an RTL task with incoming interrupts destined for Linux. If not, could you or Michael please provide one? Do you just acknowledge, record, and return to the RTL task, or do you execute some top halves. What about Counter 0 - do you lose jiffies, or is this handled specially? In a performance test which reads the TSC sequentially inside an RTL task, I'm seeing significant maximum jitter (17us with an ISA network card; 3us with a PCI network card under same network loading) which must be interrupt related. John -- John Storrs, Laboratory for Micro Enterprise 125 Culham 1 Site, Culham, Abingdon OX14 3DA, UK tel/fax 01865 407085 email [EMAIL PROTECTED] www http://www.i-way.co.uk/~storrs --- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] ---- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/
