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Date:	Tue, 8 Feb 2011 07:24:54 +0000
From:	"Haefliger, Juerg" <>
To:	Vivek Goyal <>
Subject: RE: Block IO throttling disabled in distros

> 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.


> 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
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