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Date:       Thu, 17 Aug 2000 14:11:06 +1000
From:      Peter Jeremy <peter.jeremy@alcatel.com.au>
To:        current@FreeBSD.ORG
Subject:   Re: Slow ssh throughput with -current
Message-ID:  <00Aug17.141112est.115273@border.alcanet.com.au>
In-Reply-To: <00Aug14.140905est.115211@border.alcanet.com.au>; from peter.jeremy@alcatel.com.au on Mon, Aug 14, 2000 at 02:09:01PM %2B1000
References:  <00Aug10.153604est.115242@border.alcanet.com.au> <00Aug14.140905est.115211@border.alcanet.com.au>

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On 2000-Aug-10 15:36:01 +1000, Peter Jeremy <peter.jeremy@alcatel.com.au> wrote:
>I just noticed a really peculiar network slowdown with -current from
>about a week ago.  The machine has two NICs - an old 16-bit SMC card
>(ed0) running 10baseT and a PCI SMC card (tx0) running 100baseTX full
>duplex.
>
>When I scp (either ssh-1.2.27 or OpenSSH) to a remote machine via ed0,
>I get a throughput of ~8KB/sec.  When I go via tx0, I get ~3MB/sec
>(CPU limited).  If I use ftp via ed0, I get wire speed (just over
>1MB/sec).

Having just finished instrumenting tcp_output.c to track the problem
down, I find that it has vanished.  It seems that it was fixed
sometime between 3rd August and last night.  The only change to
tcp_output.c during this time was v1.46 - which only affects error
behaviour and backing that change out had no effect (ie the problem
is still gone).  I don't recall seeing any commits that would have
affected this problem.

Peter


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