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Date: Wed, 1 Jul 2009 09:40:33 -0500
From: Brian Ford <Brian DOT Ford AT FlightSafety DOT com>
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Subject: Re: Call for TESTING (was Re: [1.7.0-50] scp progress counter  flies   through first 175 MB or so)
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On Wed, 1 Jul 2009, Corinna Vinschen wrote:

> On Jun 30 14:23, Brian Ford wrote:
> > Even more so for context switches ;-):
> >
> > http://www.cygwin.com/ml/cygwin-developers/2007-10/msg00040.html
> >
> > although this performance penalty was removed from read/write and friends:
> >
> > http://www.cygwin.com/ml/cygwin-developers/2007-12/msg00004.html
> >
> > it is still present for send/recv and friends.
>
> I removed the sig_dispatch_pending calls from send/recv and friends.

Thank you!  This should have removed the thread handshake overhead from
most all I/O calls now.  I just wish we could figure out a way to avoid
it everywhere unless it is actually necessary.  I know, PTC :-).

> Note, however, that this has no influence on the ssh/scp results we were
> talking about in this thread.  ssh/scp are using read/write calls.

Sorry, I should have investigated and bench marked the difference.

-- 
Brian Ford
Staff Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained crew...

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