Subject: bonnie++ uninterruptible under heavy I/O load
From: Christian Guggenberger 
	<christian.guggenberger@physik.uni-regensburg.de>
Reply-To: christian.guggenberger@physik.uni-regensburg.de
To: fabio.coatti@wseurope.com
Cc: vda@port.imtp.ilyichevsk.odessa.ua, linux-kernel@vger.kernel.org,
       simone.piunno@wseurope.com
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Date: Fri, 11 Mar 2005 15:24:59 +0100
Message-Id: <1110551100.7733.3.camel@bonnie.rzg.mpg.de>
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>> >
>> > Unresponsiveness is not 2.6.11 specific (we've seen the same thing on
>> > 2.6.10 and 2.6.8), not I/O scheduler specific ("as" and "deadline" behave
>> > the same) and not CPU/SMP specific (reproduced on single P4 HT and single
>> > P3), but only on these two DL585 servers we've seen bonnie++ resisting
>> > kill -9 for tens of seconds.
>> >
>> > Of course on request I can provide any other useful info.
>> > Any help is appreciated.
>>
>> I think Alt-SysRq-T will be interesting to see
>
>Unfortunately this machine is on a remote location, so we don't have access to 
>keyboard. In some days we will be able to have a report of Alt-SysRq-T, but 
>until this  of course we can provide any information that can be gathered on 
>a remote shell.

what about a: (if sysrq was enabled in the kernel)

echo "1" > /proc/sys/kernel/sysrq
echo "6" > /proc/sysrq-trigger
echo "t" > /proc/sysrq-trigger

 - Christian


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