Re: Fwd: Re: Fedora27: NFS v4 terrible write performance, is async working

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On Tue, Jan 30, 2018 at 10:30:04PM +0000, Terry Barnaby wrote:
> Also, on the 0.5ms. Is this effectively the 1ms system tick ie. the NFS
> processing is not processing based on the packet events (not pre-emptive)
> but on the next system tick ?
> 
> An ICMP ping is about 0.13ms (to and fro) between these systems. Although
> 0.5ms is relatively fast, I wouldn't have thought it should have to take
> 0.5ms for a minimal RPC even over TCPIP.

It'd be interesting to break down that latency.  I'm not sure where it's
coming from.  I doubt it has to do with the system tick.

--b.
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