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Date: Mon, 18 Dec 2017 19:34:50 +0100 From: Mike Galbraith <efault@....de> To: "J. Bruce Fields" <bfields@...ldses.org> Cc: lkml <linux-kernel@...r.kernel.org>, Jeff Layton <jlayton@...nel.org>, linux-nfs@...r.kernel.org Subject: Re: NFS: 82ms wakeup latency 4.14-rc4 On Mon, 2017-12-18 at 12:27 -0500, J. Bruce Fields wrote: > I'd forgotten about throughput/latency tradeoffs--but > couldn't those in theory be managed by runtime configuration of the > sceduler, or at least some smaller hammer than turning off preemption > entirely? A kernel that has all of the goop required to support preemption can't possibly perform as well as a kernel that can simply assume everything is safe. All that infrastructure costs cycles. -Mike
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