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Message-ID: <59DD1BA8FD3C0F4C90771C18F2B5B53A653FF72FB5@GVW0432EXB.americas.hpqcorp.net> Date: Tue, 8 Feb 2011 07:24:54 +0000 From: "Haefliger, Juerg" <Juerg.Haefliger@...com> To: Vivek Goyal <vgoyal@...hat.com> CC: LKML <linux-kernel@...r.kernel.org> 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. 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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