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Date: Fri, 12 Jun 2015 15:14:04 +0200
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: cygwin on W7: stalled scp (openssh-6.8p1), lost ssh-scp-pipe data
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On 6/12/2015 2:59 PM, Theodor DOT Kazhan AT gmx DOT de wrote:
> Hi Corinna, all,
>
> in case someone is still as curious about it as I am, it took nearly one week and 3433 attempts:
>
> $  while true; do DATE=`date +%Y%m%d_%H%M%S`; echo -n "started: $DATE"; scp -v -C -o BatchMode=yes tester AT 10 DOT IP2 DOT IP3 DOT IP4:"logDownload_m/TEST.txt" . > scp_$DATE.txt 2>&1; echo " - finished: `date +%Y%m%d_%H%M%S`"; rm -v `ls -1 scp_2015* | head -n -3`; sleep 5; done
> started: 20150605_170918 - finished: 20150605_171220
> „scp_20150603_182927.txt“ entfernt
> started: 20150605_171225 - finished: 20150605_171531
> „scp_20150603_183041.txt“ entfernt
> started: 20150605_171536 - finished: 20150605_171842
> „scp_20150603_183156.txt“ entfernt
> . . .
> started: 20150612_113735 - finished: 20150612_113845
> „scp_20150612_113347.txt“ entfernt
> started: 20150612_113850 - finished: 20150612_114003
> „scp_20150612_113502.txt“ entfernt
> started: 20150612_114009 <== this ssh-download is stalled
>
> ... to reproduce this issue one more time on my 2nd env (cygcheck attached to my previous email dated 05. June 2016, 17:00). This time, a 32k buffer (the 16k-blocks B003363 and B003364) is lost:
>
> $ sdiff -stw40 <(cat TEST.txt | sed -re "s/(B0.....-N001024-)/\1\n/g" | cut -d- -f-2) <(seq -w 1 1 94796 | sed -re "s/.*/B0&-N000001/g")
> .                   >  B003363-N000001
> .                   >  B003364-N000001
> .B094793-N000001    <
> .B094794-N000001    <
>
>
> Any advice is still highly appreciated, e.g. on howto debug into Cygwin/Win I/O-APIs, read/write functions, pipe implementation... For much more details, please refer to my previous emails.
>
>
> Thanks and BR,
> T.
>

Hi Theodor,
Question: last cygwin 2.0.4  or previous version ?

Maybe is no relevant for your case but there were some fixes

In theory during tests a 64K buffer should be faster

Regards
Marco



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