Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Oct  7 10:12, Brian Ford wrote:
> On Thu, 7 Oct 2010, Derry Shribman wrote:
> 
> > Here's a quick guess on what the problem may be:
> >
> > For network shares (SAMBA), opening any handle, even a non-GENERIC_READ
> > handle requires a round-trip to the SAMBA server over the network. This
> > could easily be 1ms for LAN (and much much more for WAN). And only after
> > you have the handle you can query it. So thats what the "open network
> > file information" structures and APIs are: for network shares that the
> > additional round-trip for CreateFile/CloseFile makes it slower.
> 
> If you folks haven't already seen the information presented here it might
> be interesting.  I know I found it useful for coding the applications we
> use to move massive amounts of data and numbers of files around.
> 
> http://download.microsoft.com/download/f/2/1/f2146213-4ac0-4c50-b69a-12428ff0b077/Optimizing_Applications_for_Remote_File_Access_Over_WAN.pptx

Powerpoint?  *shudder*

Any chance you could provide an executive summary?


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat