X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Message-ID: <48165B28.4030804@cwilson.fastmail.fm> Date: Mon, 28 Apr 2008 19:18:00 -0400 From: Charles Wilson User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.12) Gecko/20080213 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: inetutils 1.5 / ftpd problem: 426 Data connection: No buffer space available. References: <3ee066b40804272035p45746b2bwc5bebd0252d92426@mail.gmail.com> <4815777F.3060005@cwilson.fastmail.fm> <20080428084603.GX23852@calimero.vinschen.de> In-Reply-To: <20080428084603.GX23852@calimero.vinschen.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 Corinna Vinschen wrote: > > This code only exists in 1.7. The only way to get ENOBUFS in 1.5.x is > when Winsock emits it. I see two possible reasons. One is a > third-party firewall software which interacts badly with ftpd on the > machine with the ENOBUFS problem, the other is ftpd itself. Does ftpd > from 1.5 try to write the 215 Megs in one single write call, by any > chance? Why, yes, yes it does. But only if #HAVE_MMAP; otherwise it's a little more sane and uses BUFSIZ from stdio.h; 1024. > We had this discussion lately and I added a stop-gap measure > into 1.7 so that no write to the net writes more than 64K in one go. > The problem is that Winsock unintelligibly tries to create a temporary > internal buffer the size of the write buffer, regardless of its size. > Naturally that can fail, and if it does, you get the error code > WSAENOBUFS. The only way around that for 1.5 is to split network writes > to smaller chunks. Doing that is much faster on Windows, too, btw. Yeah, I'll code that up for 1.5-4. Should I stick with BUFSIZ == 1024, or when MMAP use something a little bigger, say 32k? -- Chuck -- 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/