Re: Aw: Re: Re: very poor nfs performance

[Mike Kupfer <kupfer@rawbw.com>]

Stefan K wrote:

> > Can you partition the files into 2 different shares?  Put the database
> > files in one share and access them using "sync", and put the rest of the
> > files in a different share, with no "sync"?
> this could be a solution, but I want to understand why is it so slow and fix that

It's inherent in how sync works.  Over-the-wire calls are expensive.
NFS implementations try to get acceptable performance by extensive
caching, using asynchronous operations when possible, and by issuing a
smaller number of large RPCs (rather than a larger number of small
RPCs).  The sync option defeats all of those mechanisms.

mike