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| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
| Newsgroups | linux.kernel |
| Subject | Re: Context switch latency in tickless isolated CPU |
| Date | Sun, 21 Aug 2016 17:00:01 +0200 |
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| X-Original-Cc | Peter Zijlstra <peterz@infradead.org>, Chris Metcalf <cmetcalf@mellanox.com>, Frédéric Weisbecker <fweisbec@gmail.com>, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@kernel.org |
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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@infradead.org> 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
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Context switch latency in tickless isolated CPU GeHao Kang <kanghao0928@gmail.com> - 2016-08-17 08:40 +0200
Re: Context switch latency in tickless isolated CPU GeHao Kang <kanghao0928@gmail.com> - 2016-08-18 05:30 +0200
Re: Context switch latency in tickless isolated CPU Peter Zijlstra <peterz@infradead.org> - 2016-08-19 14:40 +0200
Re: Context switch latency in tickless isolated CPU GeHao Kang <kanghao0928@gmail.com> - 2016-08-21 13:30 +0200
Re: Context switch latency in tickless isolated CPU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-21 17:00 +0200
Re: Context switch latency in tickless isolated CPU GeHao Kang <kanghao0928@gmail.com> - 2016-08-22 11:50 +0200
Re: Context switch latency in tickless isolated CPU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 16:50 +0200
Re: Context switch latency in tickless isolated CPU Mark Hounschell <markh@compro.net> - 2016-08-22 17:20 +0200
Re: Context switch latency in tickless isolated CPU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:40 +0200
Re: Context switch latency in tickless isolated CPU Mark Hounschell <markh@compro.net> - 2016-08-22 18:50 +0200
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