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Date: Tue, 29 Apr 2008 09:54:40 -0400
From: Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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Subject: Re: inetutils 1.5 / ftpd problem: 426 Data connection: No buffer  space available.
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antony baxter wrote:
> Better, in the sense that I can now retrieve the file; however
> ftpd.exe's memory usage (monitored via Task Manager) now grows
> continously during the transfer until eventually the server machine
> grinds to a halt, paging furiously. Once the transfer does finally
> finish ftpd.exe's memory usage drops back to normal (2,400K).

Hmm. A little more research shows winsock's internal behavior -- 
transfers, waitiong for ack, allocating internal buffers -- is very 
sensitive to the size of so_sndbuf (winsock default 8192) and the packet 
size (ethernet default 1560). See if one of these options gives better 
performance:

http://cygwin.cwilson.fastmail.fm/ITP/ftpd-1k.exe.bz2
http://cygwin.cwilson.fastmail.fm/ITP/ftpd-4k.exe.bz2
http://cygwin.cwilson.fastmail.fm/ITP/ftpd-8k.exe.bz2
http://cygwin.cwilson.fastmail.fm/ITP/ftpd-32k.exe.bz2 (same as prev)

Also, what is the value of
HKLM\System\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize

--
Chuck

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