Date: Thu, 25 Jan 2001 08:56:54 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Jordan Hubbard <jkh@winston.osd.bsdi.com> Cc: Paul Herman <pherman@frenchfries.net>, Jonathan Lemon <jlemon@flugsvamp.com>, net@FreeBSD.ORG Subject: Re: I have delayed ACK problems Message-ID: <Pine.BSF.4.21.0101250840280.48291-100000@besplex.bde.org> In-Reply-To: <77394.980367750@winston.osd.bsdi.com>
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On Wed, 24 Jan 2001, Jordan Hubbard wrote:
> > Something just doesn't sit well me. This shouldn't happen in a
> > 100Mbit LAN. This seems like a plain vanilla network transaction, and
> > FreeBSD is failing on something, where other OSes in the same
> > environment don't.
>
> You're almost certainly correct that there's a misfeature lurking in
> there somewhere, I don't think anybody's arguing that particular
> point, it's just that you're also (sadly) in a much better position to
> diagnose this than [m]any of your readers since we don't have an
> active failure scenario to analyze like you do. :(
I diagnosed similar problems in rmt(8) a few (?) months ago. Try:
tar cf localhost:/tmp/foo /boot/kernel
With the FreeBSD defaults, this crawls at almost precisely 100K/sec
due to its protocol waiting for an ack after every 10K block and acks
being delayed by 100 msec.
Bruce
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