X-Spam-Check-By: sourceware.org Message-ID: <4554FB10.8090900@tlinx.org> Date: Fri, 10 Nov 2006 14:20:00 -0800 From: Linda Walsh User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: cyg mem limit or network failure? Other? dd(dsk->net).blksz>=64M: Fail References: <4552ED55.7030007@tlinx.org> <20061109110013.GD18141@calimero.vinschen.de> In-Reply-To: <20061109110013.GD18141@calimero.vinschen.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm 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 Corinna Vinschen wrote: > On Nov 9 00:56, Linda Walsh wrote: > >> I was running some network bandwidth tests using "dd" (WinXP2/Cygwin) >> >> I was timing copies of a 300MB file from local disk to a remote >> server. The local computer has enough memory to hold the file >> in the memory cache once it is loaded. >> >> I ran through increasing power-of-two block sizes from >> 512 bytes up to 512MB, where it, theoretically could read >> and write the file in one read and write for the whole file. >> Essentially (say "s:" is a network drive): >> >> for (i = 512; i<=512MB; i = i*2) do { >> dd bs=$i if=/tmp/input of=/s/Video/output.dat >> } >> Unfortunately, the test /fails/ at or above 64MB with: >> dd: writing '/s/Video/output.dat': Resource temporarily unavailable >> > I tried this with a 120 Megs and 1.2 Gigs file and dd works with all > blocksize up to the tested 512 Megs for me. > > Could this be a network issue with big blocksizes, maybe --- Perhaps...though just tried it again with 32M, 64M, 128M 256M 512M and using /dev/zero as input. That works up through 256M. Will have to try looking at this some more later...strange. Thanks for the feedback. linda -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/