X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Message-ID: <4A490F0E.6040806@etr-usa.com> Date: Mon, 29 Jun 2009 12:59:26 -0600 From: Warren Young User-Agent: Thunderbird 2.0.0.22 (Windows/20090605) MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: Call for TESTING (was Re: [1.7.0-50] scp progress counter flies through first 175 MB or so) References: <2ul445d2cfjj1q2t2viropiikoj70slglb@4ax.com> <20090625101039.GP7289@calimero.vinschen.de> <20090625140508.GA17040@ednor.casa.cgf.cx> <20090625143651.GR7289@calimero.vinschen.de> <20090625145005.GB18338@ednor.casa.cgf.cx> <20090628193155.GA10407@ednor.casa.cgf.cx> <20090629092857.GZ30864@calimero.vinschen.de> <20090629095322.GD30864@calimero.vinschen.de> <20090629142348.GB19123@ednor.casa.cgf.cx> <20090629144030.GC19123@ednor.casa.cgf.cx> In-Reply-To: <20090629144030.GC19123@ednor.casa.cgf.cx> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com I scp'd a 1.6 GB file back and forth to a Linux server over GigE to a fast new RAID-10. I tested 1.7.0-50 and 20090629. Results: On a 32-bit XP box, 1.7.0-50 gives about 15 MByte/sec for both upload and download. (This box can't really hit GigE speeds due to crappy cabling and a low-quality switch.) On switching to the snapshot, the download speed is about the same, but upload is cut to 4-5 MB/sec. On a 64-bit Vista box, 1.7.0-50 gives inconsistent behavior. Download behaves as it should: ~45 MB/sec here, due to better switch and cabling. But, uploading with scp gives the reported behavior: the scp status fills out to 100% very fast but then scp doesn't finish running for quite a while. It's like it's buffering a big fraction of the 1.6 GB, which isn't impossible, since this box has 12 GB of RAM. (Core i7, DDR3, wheee!) After switching to the snapshot on that Vista-64 box, the scp progress display becomes useful, growing steadily as scp runs. Unfortunately, my upload speed is down to around 5 MB/sec here, just as on the XP box. A different non-Cygwin scp client I have here can manage much faster transfer speeds, so I can rule out disk and network bottlenecks. The slowdowns are in Cygwin itself or the Cygwin scp port. I can rule out a problem in the general network I/O handling: changing the DLL doesn't seem to affect ttcp results materially. It's either scp or the way scp uses cygwin1.dll. -- 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