On Fri, Jan 21, 2005 at 04:08:07PM -0600, David F Barrera wrote:
> I am seeing a kernel message, "hdc: lost interrupt", when running LTP on
> the xen0 domain. The first time I saw the 'kernel: hdc: lost interrupt'
> in /var/log/messages, I was running LTP on both xen0 and xenU domains.
> The xenU domain was totally hung at this point. Suspecting a setup
> error, I re-checked the installation and reran LTP on xen0 alone,
> without having anything running on xenU. Again, I saw the error. To rule
> out a hardware problem, I decided to run the same tests on a regular
> kernel from kernel.org (2.6.10) and on the RHEL 4 kernel from Red Hat,
> both of which ran without showing the error. I don't know what to make
> of it. I am not suspecting a hardware error since the message does not
> show up when running on non-xen kernels.
This may be a false lead, but I saw this (and other significant IO-related
weirdness) when I moved hardware around and forgot to enable kernel DMA support
for the IDE chipset. Overall system performance tanked (obviously), I got
a large number of hdX: Lost interrupt warnings, and even some outright panics.
Turning on DMA in dom0's kernel config cleared it all up.
Might be worth investigating anyhow,
-m
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