On Tue, Feb 13, 2018 at 07:01:22AM +0000, Terry Barnaby wrote:
The transaction system allows the write delegation to send the data
to the
servers RAM without the overhead of synchronous writes to the disk.
As far as I'm concerned this problem is already solved--did you miss the
discussion of WRITE/COMMIT in other email?
The problem you're running into is with metadata (file creates) more
than data.
PS: I have some RPC latency figures for some other NFS servers at
work. The
NFS RPC latency on some of them is nearer the ICMP ping times, ie about
100us. Maybe quite a bit of CPU is needed to respond to an NFS RPC call
these days. The 500us RPC time was on a oldish home server using an Intel(R)
Core(TM)2 CPU 6300 @ 1.86GHz.
Tracing to figure ou the source of the latency might still be
interesting.
--b.