X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-2.0 required=5.0 	tests=BAYES_00,RCVD_IN_SORBS_WEB,SPF_HELO_PASS,SPF_PASS
X-Spam-Check-By: sourceware.org
Message-ID: <4A7349CF.6030709@kc8onw.net>
Date: Fri, 31 Jul 2009 15:45:19 -0400
From: Jonathan <jonathan AT kc8onw DOT net>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.1) Gecko/20090715 Thunderbird/3.0b3
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: 1.7 ssh/rsync consuming all cpu on x64 Vista
References: <4A457DAE DOT 7010204 AT kc8onw DOT net>
In-Reply-To: <4A457DAE.7010204@kc8onw.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

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

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple