On 01/29/18 17:40, Terry Barnaby wrote:
> Now I understand that NFS's latency with writes is a performance bottleneck, 
> but in
> the past I have used the "async" mount option to good effect to minimise 
> this. It
> does not appear to have any effect on my systems. The "async" mount option is 
> not
> listed when you run "mount" to get a list of the mounts on the client. 


Pardon the brevity of this response.

I see pretty much the same numbers as you're seeing.  Sever and Client are both 
F27
and in my case both ends have SSD and the links are 1000Mb/s.

However, I'm not convinced the "issue" is related to write performance.  The 
reason I
say this is if do this on the client side

tar -zcf lin.tar f27k/linux-4.14.15/

meaning I'm reading from the server to create the tar.  The numbers were nearly
identical.  I think it may be more that the tar file has many (61337) files.  
Most of
them rather small.

FWIW, I also performed the tests using vers=3 of nfs with slightly better 
numbers on
average.

-- 
A motto of mine is: When in doubt, try it out

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