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Subject:	Re: jperf3
To:	cygwin AT cygwin DOT com
References:	<2ff4c887-3623-a829-aae3-12398c758b81 AT arcor DOT de> <9f3e0ee0-849c-263c-ad59-c7eef74934d3 AT obj-sys DOT com>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<cf84c808-01e5-379c-3a25-88f25dcada2b@gmail.com>
Date:	Mon, 3 Jul 2017 17:38:42 +0200
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On 03/07/2017 15:29, Douglas Coup wrote:
> On 7/1/2017 7:27 AM, FwAdmin wrote:
>> Hi cygwin,
>>
>> I'll report a problem using iperf on windows 10 x64.
>>
>> Probe is iperf3 runnung on an linux.
>> With a command line tool on windows 10 iperf runs without any problems.
>>
>> Problems with iperfcygwin using java.
>>
>> See here:
>>
>> bin/iperf3.exe -c a.b.c.d -P 1 -i 1 -p 5201 -f m -t 10
>>    1579 [main] iperf3 6620 find_fast_cwd: WARNING: Couldn't compute
>> FAST_CWD pointer.  Please report this problem to
>> the public mailing list cygwin AT cygwin DOT com
>> Done.
>>
>> And my CPU runs on 100% when starting "Run iperf3".
>>
>> y.s. fwadmin
>
> I had the FAST_CWD problem several years ago after a Windows upgrade.  I
> installed the latest Cygwin, and the problem stopped happening.
>
> Regards,
>
> Doug Coup
>>

he is mentioning windows 10 x64 and having the problem only with Java.
I assume that the Java machine is triggering an old compatibility
style that cygwin recognizes as old windows.
It seems not the usual FAST_CWD problem of third party.

Marco


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