linux-kernel - Re: Block IO throttling disabled in distros

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Message-ID: <4D543AD6.4000908@canonical.com>
Date:	Thu, 10 Feb 2011 12:21:58 -0700
From:	Tim Gardner <tim.gardner@...onical.com>
To:	"Haefliger, Juerg" <Juerg.Haefliger@...com>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Block IO throttling disabled in distros

On 02/08/2011 12:24 AM, Haefliger, Juerg wrote:
>> On Mon, Feb 07, 2011 at 03:33:38PM +0000, Haefliger, Juerg wrote:
>>> Hi,
>>>
>>> Both RHEL6 and Ubuntu 10.10 have block IO throttling disabled in
>> their kernels. Does anybody know why that is? Are there performance or
>> stability issues with the throttling controller or does it somehow
>> negatively interfere with the rest of the kernel and/or system?
>>
>> Block IO throttling support was not even upstream at that time hence
>> you don't see it.
>
> Duh! I thought I checked that the code was there but just not enabled. I just double-checked and sure enough block IO throttling is not in the RHEL6 kernel source. Sorry for the noise.
>
> Thanks
> ...Juerg
>
>
>> I have not heard about any stability issues so far. Of course more
>> testing will reveal that.
>>
>> The only thing I have thinking is that should we limit the number of
>> bios queued per IO context on the device. Currently there is no such limit
>> and one can queue up as many bios as one want to.
>>
>>
>> Thanks
>> Vivek
> --

CONFIG_BLK_DEV_THROTTLING=y in what will be Ubuntu 11.04

rtg
-- 
Tim Gardner tim.gardner@...onical.com
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