From: Eric Dumazet <eric.dumazet@xxxxxxxxx> Date: Tue, 07 Jun 2011 08:50:03 +0200 > From: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > > Frank Blaschka reported : > <quote> > 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. > </quote> > > This patch is a straightforward implementation of Frank suggestion : > > Transfert poll_list and trigger NET_RX_SOFTIRQ on new cpu. > > Reported-by: Frank Blaschka <blaschka@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx> > Tested-by: Eric Dumazet <eric.dumazet@xxxxxxxxx> Applied, thanks everyone. -- 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
