Dear all
I tried to test of latnecy with a etherlab on the xenomai framework. The etherlab is ethercat master implimentation in the Linux Evironment and It's using normal ethernet interface card. In my test, I have found huge latency under hard disk stress situation. For making hard disk stress, I ran nomal linux process that is "while: do ls -lR / > /tmp/list; done & > /dev/ null". After than I also run xenomai task with etherlab master api. The latest latency is above a 500us. It is unacepptable on my system. When I run latency test tool of xenomai, the latency is under a 5us I think the real-time task and communication of NIC is intercepted by hard disk IRQ. Is there any idea to prevent interruption of sata hard driver's during real-time task run. Thanks for any comment or suggestion regarding that problem. Hardware CPU : Core 2 Duo L7400 1.5ghz ICH : ICH7 NIC : realteck 8139c ( 8139too ) HDD : SATA 2 250 Mb 5000rpm Real Time Environment Debian sqeeze, kernel 2.6.37.6, Xenomai-2.5.6, adeos-ipipe-2.6.37.6-x86-2.9-02.patch EtherLab-1.5 stable Cycle time 1ms Best regard, Donggu Kang. _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
