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Date: Fri, 29 Nov 2002 14:17:25 +0100 (CET)
From: =?iso-8859-1?Q?Rasmus_B=F8g_Hansen?= <moffe@amagerkollegiet.dk>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PROBLEM] NFS trouble - file corruptions
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On Thu, 28 Nov 2002, Trond Myklebust wrote:

> >>>>> " " == Rasmus B?g Hansen <moffe@amagerkollegiet.dk> writes:
>
>     >> Does it also occur if you play around with setting rsize and
>     >> wsize = 1024?
>
>      > I'm afraid so - I just double-checked...
>
> Given that you are saying that even synchronous RPC (which is the
> default for r/wsize = 1024) is failing, then my 2 main suspicions are
>
>   - hardware failure: Have you tried this on several different
>     server/client combinations and hardware combinations?

Sigh:

Just tried reversing the process (ie. exchanging the client/server
role): No trouble at all, no errors in files.

I just tried turning off DMA on the server disk (this is just a low-end
IDE-system): No errors in files (compressing the file thrice).

So it does not at all seem to be a NFS-issue!

I have no idea what is wrong. If the disk, cable or IDE controller does
bit-flipping when DMA is turned on, why is the problem only seen with
NFS? I have never seem corrupted files or metadata with DMA turned
(except once long ago, when I experimented with high-transfer-modes - I
haven't done that since)...

Thanks for your help!

Regards
/Rasmus

(damn, PIO-mode performance sucks!)

-- 
-- [ Rasmus "M?ffe" B?g Hansen ] ---------------------------------------
He who asks a question is a fool for five minutes; he who does not ask a
question remains a fool forever.
----------------------------------[ moffe at amagerkollegiet dot dk ] --

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