ezmlm warning

Mon Oct 5 09:09:00 GMT 2015

Hi! This is the ezmlm program. I'm managing the
cygwin@cygwin.com mailing list.

Messages to you from the cygwin mailing list seem to
have been bouncing. I've attached a copy of the first bounce
message I received.

If this message bounces too, I will send you a probe. If the probe bounces,
I will remove your address from the cygwin mailing list,
without further notice.

I've kept a list of which messages from the cygwin mailing list have 
bounced from your address.

Copies of these messages may be in the archive.
To retrieve a set of messages 123-145 (a maximum of 100 per request),
send an empty message to:
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Here are the message numbers:

   199149
   199149

--- Enclosed is a copy of the bounce message I received.

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To: cygwin-return-199149-listarch-cygwin=sourceware.org@cygwin.com
From: litter@null.net
Subject: Re: Bash / cygwin process spawning (?) performance very slow
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Date: Wed, 23 Sep 2015 12:28:03 +0200
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> litter@null.net:
> Wed, 23 Sep 2015 10:52:26 +0200
> ---------------------------------------------------
> > Hi all,
> > 
> > I noticed that doing simple loops in Bash takes unexpectedly long under Cygwin on a Windows XP 32 bit machine 
> > (CYGWIN_NT-5.1 <machine> 2.2.1(0.289/5/3) 2015-08-20 11:40 i686 Cygwin)
> > 
> > I already followed the FAQ advice in trying to determine general causes, and made a 'shadow' copy of /etc/passwd as described.
> > My PATH does not contain references to network shares.
> > 
> > Still quite normal commands take a long time e.g. 
> > time cat some-file | while read i;do echo $i;/bin/true;done
> > 
> > real 1m44.953s
> > user 0m9.599s
> > sys 1m36.865s
> 
> #wc t; time cat t  | while read i;do echo $i;/bin/true;done >/dev/null
>  172  172 3448 t
>     3.73s real     0.04s user     0.43s system
> 
> On cygwin 1.7.35 and XP32. Not THAT fast but similar to your 
> linux-result. I guess your antivirus is interfering. I've configured 
> my avast to not deep-scan anything in C:\cygwin\bin, maybe that helps.
> 

Thanks for the reply Helmut,

Although the /dev/null probably contributes a bit to the timing
it's clear not all 32 bit XP systems suffer from this, thanks for that!

I'm not running any antivirus as far as I'm aware of (I do run a Comodo firewall with all "virus" scanning disabled).
Any idea how to diagnose the cause of this? Is there any Cygwin specific logging/tracing to see where it is happening?
I checked again, and it really is the Bash.exe which is consuming a lot of Kernel time. I didn't spot another process kicking in and consuming cycles.

Thanks,
Paul