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Re: 1.5.11-1: sftp performance problem
- From: "Bob Byrnes" <byrnes at curl dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 13 Sep 2004 13:45:17 -0400
- Subject: Re: 1.5.11-1: sftp performance problem
- Organization: Curl Corporation
On Sep 9, 1:46pm, Peter Siebold wrote:
-- Subject: 1.5.11-1: sftp performance problem
> I updated to the newest version of cygwin dll on 9/7/4 and after sftp
> suffered performance issues when issuing a get on a large file. File
> transfers now stall and do not complete. After downgrading to version
> of 1.5.10-3 of cygwin sftp then it works fine.
-- End of excerpt from Peter Siebold
Hi Peter ...
I am continuing to investigate this issue (see the cygwin-patches mailing
list for ongoing discussions if you're interested).
The problem was triggered by ...
On Sep 4, 11:51pm, Christopher Faylor wrote:
-- Subject: [ANNOUNCEMENT] Updated: cygwin-1.5.11-1
> Changes since 1.5.10-3:
> - Fix some problems with rsync hangs on Windows NT class systems. (Bob Byrnes)
-- End of excerpt from Christopher Faylor
Here are some work-arounds that you can use until we have a real fix,
listed in order of most- to least-recommended:
-- Use slightly smaller buffers with sftp.
"sftp -B 8192" or even "sftp -B 12288" should work.
The default buffer size seems to be 16k (in spite of the manpage,
which claims it is 32k).
-- Use scp or some other file transfer protocol over ssh,
like rsync or tar. The problem seems to affect sftp more
than other programs.
-- Downgrade to a version of cygwin before 1.5.11-1.
I hope this helps.
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