linux-kernel - Re: [PATCH] sata_nv ADMA/NCQ support for nForce4 (updated) II

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Message-id: <453B1946.3070201@shaw.ca>
Date:	Sun, 22 Oct 2006 01:09:58 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH] sata_nv ADMA/NCQ support for nForce4 (updated) II

Andi Kleen wrote:
> Andi Kleen <ak@...e.de> writes:
> 
>> I tested it on a NF4-Professional system with 8GB RAM and a single 
>> SATA disk. It first did nicely in LTP and some other tests,
>> but during a bonnie++ run it eventually blocked with all
>> IO hanging forever. No output either. I did a full backtrace
>> and it just showed the processes waiting for a IO wakeup.
> 
> Hmm, to follow myself up: after a few more minutes the machine recovered
> and i could log in again (overall the stall was at least 5+ minutes
> though)
> 
> Not sure whom to blame, the IO driver might be actually innocent
> and it just be one of the usual known but unfixed IO starvation problems.
> 
> -Andi

Hmm.. The system hanging up for 5 minutes and then recovering seems 
rather odd, as far as I know the timeouts in libata are all quite a bit 
shorter than that. Was there anything unusual in dmesg? If the IO 
commands weren't completing at the driver level then I would expect the 
error handling to kick in in some fashion..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/
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