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Subject: Re: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?
From: Chris Roehrig <croehrig AT house DOT org>
In-Reply-To: <58bdc0c3-d843-343f-d88e-c8a44ec33a15@cornell.edu>
Date: Tue, 31 Aug 2021 12:53:02 -0700
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To: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
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Thanks, I did some more tests:
	scp also shows no improvement with topic/pipe.    I tried running cygsshd with CYGWIN=pipe_byte as well as empty (in the registry HKLM/SYSTEM/CurrentControlSet/Services/cygsshd/Parameters/Environment/), using net stop cygsshd + net start cygsshd to restart it.   Not sure if that CYGWIN only applies to cygsshd or to all cygwin tasks.

I get the procps error just running 'procps' command with no args from mintty (/usr/bin/procps).     Looking at the procps-ng source (procps-ng 3.3.17-1 is what setup_x86_64 reports as my installed package), it appears to be a mmap() failure.

I'm wondering if I built/installed cygwin1.dll correctly because I don't get the procps error using the latest stock cygwin1.dll as installed by setup_x86_64.

-- Chris



On Tue Aug 31 2021, at 12:05 PM, Ken Brown via Cygwin <cygwin AT cygwin DOT com> wrote:

> On 8/30/2021 7:58 PM, Chris Roehrig wrote:
>> I got it to build and tried out the topic/pipe branch (checked out on Monday around 4:30pm PDT):
>> 1.  I didn't see any improvement in my sshd+rsync time, still 3-4 MB/sec.
>> 2.  I get the following error from procps:   procps:ps/output.c:2195: please report this bug
>> (I also get this using the main branch build).
>> I first updated my cygwin normally using setup-x86_64.exe, then built and copied only the cygwin1.dll into /bin from the install/bin directory (quitting all cygwin tasks first).
> 
> Thanks for testing.
> 
> We're still working on this.  (The discussion has moved to the cygwin-developers mailing list.)  I'll let you know when it's stable, and maybe you can try again.
> 
> As to the procps error, can you give details so that someone can try to reproduce it and debug it?
> 
> Ken
> 
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