Hi everyone, I am trying to troubleshoot some strange performance issues I am seeing on a machine of mine. Said machine had 10 drives mapped via separate dm-crypt instances. The aggregate (read) throughput seems to hover around 120-130MB/s (looking at iostat -x -d) when running an instance of dd if=/dev/dm-<instance> of=/dev/null bs=1m for each mapping. However "top" shows that one core is loaded with 99% system tasks, and two to three cores are spinning in iowait. All the kworkers get their share of roughly 10% CPU.
"taskset" shows that all of the kworkers have an affinity mask of 1, so they can run on core 0 only, and trying to change it results in an error of "Invalid argument". Is there a way I can make the scheduler put those on multiple cores? Please cc: me since I am not subscribed. Regards, Christian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
