Re: why nfs server delay 10ms in nfsd_write()?

[Avi Kivity <avi@argo.co.il>]

On Thu, 2005-05-19 at 09:59 -0400, Lee Revell wrote:
> On Thu, 2005-05-19 at 08:53 -0400, Peter Staubach wrote:
> > There are certainly many others way to get gathering, without adding an
> > artificial delay.  There are already delay slots built into the code 
> > which could
> > be used to trigger the gathering, so with a little bit different 
> > architecture, the
> > performance increases could be achieved.
> > 
> > Some implementations actually do write gathering with NFSv3, even.  Is
> > this interesting enough to play with?  I suspect that just doing the 
> > work for
> > NFSv2 is not...
> 
> Also, how do you explain the big performance hit that steve observed?
> Write gathering is supposed to help performance, but it's a big loss on
> his test...
> 

that would depend on the NFS client and the application. for example, if
the NFS client has no (or low) concurrency, then write gathering would
reduce preformance.