linux-kernel - Re: linux-next: Tree for December 27

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Date:	Mon, 27 Dec 2010 17:16:40 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	piotr@...owicz.com
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Tree for December 27

2010/12/27 Piotr Hosowicz <piotr@...owicz.com>:
> On 27.12.2010 16:13, Piotr Hosowicz wrote:
>>
>> On 27.12.2010 16:08, Sedat Dilek wrote:
>>>
>>> 2010/12/27 Piotr Hosowicz<piotr@...owicz.com>:
>>>>
>>>> On 27.12.2010 15:48, Sedat Dilek wrote:
>>>>>
>>>>> 2010/12/27 Piotr Hosowicz<piotr@...owicz.com>:
>>>>>>
>>>>>> On 27.12.2010 07:04, Stephen Rothwell wrote:
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I noticed that after first reboot with this kernel that my MP3
>>>>>> collection
>>>>>> in
>>>>>> mocp layed on Ext4 fs opens painfully slow. It is not my mistake,
>>>>>> because
>>>>>> I
>>>>>> always do it the same way, new kernel, then music on. The problem
>>>>>> is not
>>>>>> present in rc7-git4. I could measure it in some way (timing ls -la
>>>>>> in tht
>>>>>> dir?) if somebody needs it.
>>>>>>
>>>>>> Regards,
>>>>>>
>>>>>> Piotr Hosowicz
>>>>>>
>>>>>
>>>>> You tried mblk_io_submit mount-option for that partition?
>>>>
>>>> No, I do not use it, I do not even know what it is. My options are:
>>>>
>>>> /dev/sda2 on / type ext4 (rw,errors=remount-ro)
>>>>
>>>
>>> Have a closer look at "ext4: Turn off multiple page-io submission by
>>> default"
>>
>> I tried to Google for mblk_io_submit but I didn't find anything helpful.
>> Could you tell me how should I add this option in fstab and what will be
>> its effect?
>
> As far as I understand that option regards writing, not reading. The
> symptoms I described occured while reading only.
>

That's the only performance issue I am aware of in ext4 in recent time.
Why don't you try it and present some numbers in transfer ratio (write, read)?

- Sedat -
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