Re: Block IO throttling disabled in distros

[Tim Gardner]

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@xxxxxxxxxxxxx
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