Le mercredi 01 juin 2011 Ã 12:33 +0200, Frank Blaschka a Ãcrit : > Hi Dave, Eric, > > during heavy network load we turn off/on cpus. > Sometimes this causes a stall on the network device. > Digging into the dump I found out following: > > napi is scheduled but does not run. From the I/O buffers > and the napi state I see napi/rx_softirq processing has stopped > because the budget was reached. napi stays in the > softnet_data poll_list and the rx_softirq was raised again. > > I assume at this time the cpu offline comes in. > the rx softirq is raised/moved to another cpu but napi stays in the poll_list > of the softnet_data of the now offline cpu. > > reviewing dev_cpu_callback (net/core/dev.c) I did not find the poll_list > is transfered to the new cpu. Do you think this could cause the stall or > did I miss something? > > Thx for your help. Hi Frank I believe you are right, I cant see where the poll_list transfert from dead cpu to online cpu is done. Do you want to prepare a patch ? Thanks ! -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
