Re: No I/O performed by windowsaio/get_io_u: zero buflen

[Jens Axboe <axboe@kernel.dk>]

On 9/16/18 5:24 PM, smitha sunder wrote:
> On Sun, Sep 16, 2018 at 3:02 PM, Sitsofe Wheeler <sitsofe@gmail.com> wrote:
>> On Sat, 15 Sep 2018 at 23:14, smitha sunder <sundersmitha@gmail.com> wrote:
>>>
>>> Hello all,
>>>
>>> I have a 30TB drive and I am running into an issue with random writes.
>>> I went through this thread :
>>> https://www.spinics.net/lists/fio/msg06294.html that seems to be fixed
>>> already.
>>
>> I think that was something different regarding different blocksizes
>> per direction.
>>
>>> I see the same issue with random reads as well.
>>> So not sure what is the issue here in my case; any help is greatly appreciated.
>>>
>>>
>>> Read Capacity results:
>>>    Protection: prot_en=1, p_type=1, p_i_exponent=0 [type 2 protection]
>>>    Logical block provisioning: lbpme=1, lbprz=1
>>>    Last logical block address=58781073407 (0xdaf9fffff), Number of
>>> logical blocks=58781073408
>>>    Logical block length=512 bytes
>>>    Logical blocks per physical block exponent=3 [so physical block
>>> length=4096 bytes]
>>>    Lowest aligned logical block address=0
>>> Hence:
>>>    Device size: 30095909584896 bytes, 2.87017e+007 MiB, 30095.9 GB
>>>
>>>
>>> C:\Program Files (x86)\fio>fio --ioengine=windowsaio --group_reporting
>>> --direct=1 --size=100% --bs=4K --thread --filename=\\.\PhysicalDrive1
>>> --name=precond --rw=randwrite --iodepth=1 --numjobs=1
>>> --debug=io,random
>>
>> <snip>
>>
>>> io       3372  fill: io_u 0A458780:
>>> off=0x144365e7d000,len=0x0,ddir=1,file=\\.\PhysicalDrive1
>>> io       3372  get_io_u: zero buflen on 0A458780
>>> io       3372  get_io_u failed
>>> io       3372  drop page cache \\.\PhysicalDrive1
>>> random   3372  off rand 17311067694306724737
>>
>> That offset is crazy big - I'm sure it's bigger than a petabyte so my
>> guess is that something is overflowing. If you use --size=27g does the
>> job go through?
>>
>> [...]
>>
>>> I don’t see this issue if I use bs=8K or I use ba=512,8K, etc.
>>
>> --
>> Sitsofe | http://sucs.org/~sits/
> Hi Sitsofe,
> 
> Thanks for the reply!
> 
> Yes; If I use --size=27G or if provide the exact size that the OS
> displays, then the job goes through.

Are you running a 32-bit or 64-bit build of fio?

-- 
Jens Axboe