On Sun, Aug 21, 2016 at 07:26:04PM +0800, GeHao Kang wrote: > On Fri, Aug 19, 2016 at 8:34 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > > Why are you wanting to use nohz_full if you do syscalls? > > We hope to reduce the overhead of the tick while the real time > applications run, > and these applications might do some syscalls to operate the I/O devices like > EtherCAT. If latency is all you care about, one approach is to map the device registers into userspace and do the I/O without assistance from the kernel. Alternatively, use in-memory mailbox/queuing techniques to hand the I/O off to some other thread. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
