On Wed, 27 Aug 2014 17:59:27 -0500 Mike Travis <tra...@sgi.com> wrote:
> > We have a large university system in the UK that is experiencing > very long delays modprobing the driver for a specific I/O device. > The delay is from 8-10 minutes per device and there are 31 devices > in the system. This 4 to 5 hour delay in starting up those I/O > devices is very much a burden on the customer. That's nuts. > There are two causes for requiring a restart/reload of the drivers. > First is periodic preventive maintenance (PM) and the second is if > any of the devices experience a fatal error. Both of these trigger > this excessively long delay in bringing the system back up to full > capability. > > The problem was tracked down to a very slow IOREMAP operation and > the excessively long ioresource lookup to insure that the user is > not attempting to ioremap RAM. These patches provide a speed up > to that function. With what result? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
