Re: [btrfs-transacti] & btrfs-endio-wri] - WAS: Re: [btrfs-delalloc-]

[Proskurin Kirill <k.proskurin@corp.mail.ru>]

On 06/30/2011 09:13 PM, Josef Bacik wrote:
> On 06/30/2011 10:12 AM, Proskurin Kirill wrote:
>> On 06/29/2011 08:14 PM, Josef Bacik wrote:
>>>> Ok - I upgrade to 2.6.39-2 but it is seems to all things get worse.
>>>> Now I see [btrfs-transacti]&   btrfs-endio-wri] 80-100% all the time and
>>>> io performance looks like lower then before.
>>>>
>>>> Our scribe daemon in state D most of the time with half of a normal
>>>> load. Only kernel was changed.
>>>>
>>>> Any performance tune recommendation?
>>>>
>>>
>>> Can you get sysrq+w while this problem is happening so we can see whats
>>> going on?  Thanks,
>>
>> I attached sysrq+w. Hope it helps.
>>
>
> Heh so it just looks like you are writing a bunch of stuff, that's not
> particularly helpful.  What does this program do generically?  How full
> is your fs?  Do you have snapshots/subvolumes?  If so how many?  Thanks,

Scribe is taling logs by network. ~300 hosts send it to it and scribe 
write them to fs. I use zlib compression on btrfs partition.

Mount options is noatime,noacl,compress-force=zlib

iostat -x 1 tells me what util of btrfs partition is from 50% to ~90% 
all the time.

Btrfs partition is near full:
Size  Used Avail Use%
28T   26T  2.1T  93%

I don`t use snapshots/subvolumes at this time so none.

-- 
Best regards,
Proskurin Kirill