linux-kernel - Re: [PATCH] add check do_direct

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Date:	Mon, 30 Jul 2007 20:45:25 -0700
From:	Badari <pbadari@...ibm.com>
To:	Joe Jin <joe.jin@...cle.com>
CC:	Zach Brown <zach.brown@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	gurudas pai <gurudas.pai@...cle.com>,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	lkml <linux-kernel@...r.kernel.org>, wen.gang.wang@...cle.com
Subject: Re: [PATCH] add check do_direct_IO() return val

Joe Jin wrote:
>> Well, I'm having a heck of a time getting this to fail.  It looks  
>> possible, though.  Joe, were you guys able to narrow it down to a  
>> reproducible test case?  Do you have any oops output messages from  
>> the crashes?
>>     
>
> Zach, it easy to reproduce through fio with following config file
>
> # cat jobfile
> [global]
> bs=8k
> iodepth=1024
> iodepth_batch=60
> randrepeat=1
> size=1m
> directory=/home/oracle
> numjobs=20
> [job1]
> 	ioengine=sync
> 	bs=1k
> 	direct=1
> 	rw=randread
> 	filename=file1:file2
> [job2]
> 	ioengine=libaio
> 	rw=randwrite
> 	direct=1
> 	filename=file1:file2
> [job3]
> 	bs=1k
> 	ioengine=posixaio
> 	rw=randwrite
> 	direct=1
> 	filename=file1:file2
> [job4]
> 	ioengine=splice
> 	direct=1
> 	rw=randwrite
> 	filename=file1:file2
> [job5]
> 	bs=1k
> 	ioengine=sync
> 	rw=randread
> 	filename=file1:file2
> [job7]
> 	ioengine=libaio
> 	rw=randwrite
> 	filename=file1:file2
> [job8]
> 	ioengine=posixaio
> 	rw=randwrite
> 	filename=file1:file2
> [job9]
> 	ioengine=splice
> 	rw=randwrite
> 	filename=file1:file2
> [job10]
> 	ioengine=mmap
> 	rw=randwrite
> 	bs=1k
> 	filename=file1:file2
> [job11]
> 	ioengine=mmap
> 	rw=randwrite
> 	direct=1
> 	filename=file1:file2 
>
>   
Hmm.. in this config file, whats causing DIO to panic ? Which test actually
passing faulty buffer ?

Thanks,
Badari
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