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charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Mailer: Zimbra 9.0.0_GA_4653 (ZimbraWebClient - GC136 (Linux)/9.0.0_GA_4653) Thread-Index: g86pqJgTpbrf6FA+NsgcyAWZ4o6syg== Thread-Topic: Controlling cpu for interrupts X-Proofpoint-ORIG-GUID: 4SmeaTIfLJctxDOUc9kRTK46x9JCiObh X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjA5MDA4NCBTYWx0ZWRfX1XFdkydD6iT7 iW2XUOPogyYl6z9vY4MT8wDLA/sDZ0gnylf83h8Jb2m2uChRB/Z7Ft/VHJez2JTVm0BeF4YyLGt bfF69c/hvXSg46WS41ZC2vu0YqS0cBLShquF2bYEvYGIVdXiUdtS2XPNjGgFyQePSKTE+yIP42K zyN49ce1sqCg7E4XBli6ZwwWms3+THVvw92HqKW4A0tSxoguX9ZkMhHhGsw5Fud6HH783jqGrSU Z/buJ11KBHYQyxIB60A0zUdVIrxyPRTOH6YOKdu6BWSfGRC3XlpJI37JDqui24Kt6F22Yg5NDbU ssyT6ZAUDHaalOLmwVwRcdrX2nzj0YBanDCcOZFHo7Lyf4K2qSsuBJt5VeJsMQTKCSwsMzR+/13 3RUbJUMX X-Proofpoint-GUID: 4SmeaTIfLJctxDOUc9kRTK46x9JCiObh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-09_04,2025-06-05_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 phishscore=0 adultscore=0 suspectscore=0 mlxlogscore=478 bulkscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2505160000 definitions=main-2506090084 Hi=20 I have a setup with - Xenomai 3.1=20 - Linux 4.14 ish - RT Net e1000e + igb - Peak PCAN When I look closely on the rt-threads I can see that the IRQ from the CAN s= eems to be coming in on certain cores, but now always the same.=20 Here is an example of my ../xenomai/irq file: IRQ CPU0 CPU1 CPU2 CPU3 18: 0 0 0 130419960 pcan pcan pc= an pcan pcan pcan 19: 88638780 0 0 0 pcan pcan pc= an pcan 127: 3215 0 0 0 rteth0-TxRx-= 0 Thus, for this case it seems like IRQ19 is handled by CPU0 while IRQ18 is h= andled on CPU3 What is the heuristics, if any, used for decing this ? Thanks Per =C3=96berg=20