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Date: Tue, 10 Jan 2012 17:39:00 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: socket performance (was Re: Building cygwin1.dll)
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On Jan 10 17:28, Corinna Vinschen wrote:
> On Jan 10 15:24, Steven Hartland wrote:
> > If your running Windows 7 or 2k8 are you running the following hotfix, if not
> > you should try that too, just in case you machine has got a degraded tcp
> > stack.
> > 
> > http://support.microsoft.com/kb/983528
> 
> I tried that, but it doesn't install.  The installer tells me "The
> update is not applicable to your computer."  This is W7 64 bit on a
> Lenovo laptop.
> 
> What's also puzzeling is this.  I tried this on three virtual machines
> as well, W7 32, W7 64, 2008R2 64.  In all three VMs scp was almost just
> as fast as sftp, about 13 MB/s. 
> 
> So why is scp (and rsync, too, btw) half as fast on the real HW as on
> the VMs while sftp is three times faster?!?  That doesn't make sense.

...and just for kicks I replaced the laptop drive with another one
holding a W7 32 bit installation and tried with that.  Now scp and sftp
are both fast, about 36 MB/s.  Go figure!


Corinna

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

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