Re: FS / Kernel question choosing the correct kernel version

[Mark Nelson <mark.nelson@inktank.com>]

On 06/26/2012 11:15 AM, Stefan Priebe wrote:
> Am 26.06.2012 11:07, schrieb Stefan Priebe:
>> Am 26.06.2012 00:11, schrieb Sage Weil:
>>> On Sat, 23 Jun 2012, Stefan Priebe wrote:
>>>> Hi,
>>>>
>>>> i got stuck while selecting the right FS for ceph / RBD.
>>>>
>>>> XFS:
>>>> - deadlock / hung task under 3.0.34 in xfs_ilock / xfs_buf_lock while
>>>> syncfs
>>>
>>> There was an ilock fix that went into 3.4, IIRC. Have you tried vanilla
>>> 3.4? We are seeing some lockdep noise currently, but no deadlocks yet.
>>
>> Will test 3.4.4 soon.
>
> With btrfs i have 13-14.000 iops while doing random 4k writes from kvm.
> With XFS and 3.4.4 i have 814 ;-( and got a lot of slow request noise in
> ceph.log ;-( so 814 iops are not an option to me. Or is there anything
> special i've to respect while using XFS.
>
> Greets
> Stefan
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Hi Stefan,

If you can, it would be really interesting to see the blktrace results 
during these tests for both xfs and btrfs.  blktrace is in the ubuntu 
repositories and can be run quite easily from the command line during 
your test.

Thanks,
Mark