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

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

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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,

I found what my btrfs partition now is really slow. Something wrong 
happend. I try on 2.6.32 and 2.6.39 - same result. It is because 
partition is almost full?

I run a simple cycle to clean some old files:
for i in `cat /tmp/delit`; do rm -f $i ; done

And it is takes about 5-10 second per file to delete.
I get sysrq+w while rm is work - it is attached.

-- 
Best regards,
Proskurin Kirill

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