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Date:	Fri, 31 Jul 2009 15:45:19 -0400
From:	Jonathan <jonathan AT kc8onw DOT net>
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Subject:	Re: 1.7 ssh/rsync consuming all cpu on x64 Vista
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I tried again using 1.7.0-52 (-54 is not working for me) my current 
uname -a is
CYGWIN_NT-6.0-WOW64 SAGER9262 1.7.0(0.212/5/3) 2009-07-24 09:59 i686 Cygwin

I simplified things a bit this time by using scp instead of rsync, I 
still see 100% cpu usage by ssh while sending data.  An strace can be 
found at http://serenity.kc8onw.net/strace.log or the compressed version 
http://serenity.kc8onw.net/strace.log.tbz

Not being all that familiar with debugging at this level the only things 
that stand out to me are the (relatively) long times spent when scp 
calls peek_pipe and when ssh calls writev (if that is the correct 
interpretation of the strace).

Any suggestions for further digging or anything about the trace that 
seems odd?

Jonathan

On 6/26/2009 10:02 PM, Jonathan wrote:
> I've noticed that most of the time when doing an rsync tranfser over ssh
> from my laptop to my server both ssh and rsync will max out a processor
> core each and the transfer rate, even on a gigabit LAN, is only about
> 250KB/s.
>
> Other than the slow transfer rate and significant CPU usage rsync seems
> to run correctly.
>
> I tried to browse the strace output from a partial run but I don't know
> enough to see anything obviously wrong in the strace output.
>
> uname -a
> CYGWIN_NT-6.0-WOW64 SAGER9262 1.7.0(0.210/5/3) 2009-06-18 12:51 i686 Cygwin

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