Re: fio rbd hang for block sizes > 1M

[Mark Kirkwood <mark.kirkwood-6STWZtX7tXAqAMOr+u8IRA@public.gmane.org>]

Righty, building now.

On 25/10/14 13:12, Mark Nelson wrote:
> Hi Mark,
>
> Try the latest giant branch.  I believe we've fixed this with 7272bb8.
> My test cluster is passing read tests now.
>
> Mark
>
> On 10/24/2014 05:45 PM, Mark Kirkwood wrote:
>> Interestingly, I first encountered this on (what I think is) 0.86
>> release (0.86-1precise). I wonder if you had a bigger rbd cache on the
>> release cluster you tested?
>>
>> As mentioned in the same named thread on -users, disabling the rbd cache
>> stops the hang.
>>
>> Regards
>>
>> Mark
>>
>> On 25/10/14 03:09, Mark Nelson wrote:
>>> More info:
>>>
>>> I went back and tested fio versions back to 2.1.10 and still encountered
>>> the issue.  I then went back and tested the v0.86 release versus giant
>>> and was able to get through a 4MB read test without error.  I suspect
>>> this is not an fio problem.  I'll try to narrow down the commit after
>>> 0.86 that is causing this.
>>>
>>> Mark
>>>
>>> On 10/24/2014 08:19 AM, Mark Nelson wrote:
>>>> FWIW we are seeing this at Redhat/Inktank with recent fio from master
>>>> and ceph giant branch as well.
>>>>
>>>> Mark
>>>>
>>>> On 10/24/2014 01:17 AM, Mark Kirkwood wrote:
>>>>> On 24/10/14 18:35, Jens Axboe wrote:
>>>>>> CC'ing relevant parties, leaving email intact.
>>>>>>
>>>>>
>>>>> Note that the 'Killed' is because I killed the run - it hangs and
>>>>> appears to be non interruptable. I missed that when pasting, sorry!
>>>>>
>>>>>>> $ fio read-test.fio     # attached
>>>>>>> rbd_thread: (g=0): rw=read, bs=2M-2M/2M-2M/2M-2M, ioengine=rbd,
>>>>>>> iodepth=32
>>>>>>> fio-2.1.13-88-gb2ee7
>>>>>>> Starting 1 process
>>>>>>> rbd engine: RBD version: 0.1.8
>>>>>>> Killed1 (f=1): [R(1)] [inf% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta
>>>>>>> 1158050441d:06h:59m:33s]
>>>>>
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>>
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