Re: [Xen-devel] Problems with dom0 and low memory

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

If under tight memory conditions you get errors from the blkdev layer
in DOM0 then the backend driver will simply send those erros back to
the frontend, which will pass the error up into xenU's blkdev layer.
What ext3 then does with that error is not really Xen's problem -- a
similar low-memory condition running directly on the hardware (i.e.,
without Xen)  would likely have the same outcome.

 -- Keir

> 
> I am running a Xen box where I need a lot of memory for a given domain 
> (which runs memory-hungry java apps). I had reduced the memory of 
> domain0 to 42000KB. It *seems* that after running OK for a while, a low 
> memory condition on domain0 messed during a short time the VBD of the 
> other domains, and they got a burst if I/O errors. After this event, the 
> other domains were still running, and their VBD were still working, but 
> the burst of I/O errors aborted the ext3 journal on the filesystems 
> (causing them to go read-only).
> 
> Here are the kernel logs of both domains if you want to check that it's 
> indeed a low memory condition problem and not something else (which 
> would then be a "real" bug).
> 
> I increased the memory allocated to domain0, but it would be interesting 
> to know if there is a way to avoid those problems (I thought about 
> increasing /proc/sys/vm/min_free_kbytes ; would it be useful here?)
> 
> The dom0 and domU kernels, as well as xen itself, the associated 
> symbols, and the same log files are located here, if someone needs them:
> http://skaya.enix.org/webs/xen/dom0-lowmem/
> 
>    Press C-c C-c here for "application/gzip; name="dom0-kern.log.gz"" data
>    Press C-c C-c here for "application/gzip; name="domU-kern.log.gz"" data
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I am running a Xen box where I need a lot of memory for a given domain 
(which runs memory-hungry java apps). I had reduced the memory of 
domain0 to 42000KB. It *seems* that after running OK for a while, a low 
memory condition on domain0 messed during a short time the VBD of the 
other domains, and they got a burst if I/O errors. After this event, the 
other domains were still running, and their VBD were still working, but 
the burst of I/O errors aborted the ext3 journal on the filesystems 
(causing them to go read-only).

Here are the kernel logs of both domains if you want to check that it's 
indeed a low memory condition problem and not something else (which 
would then be a "real" bug).

I increased the memory allocated to domain0, but it would be interesting 
to know if there is a way to avoid those problems (I thought about 
increasing /proc/sys/vm/min_free_kbytes ; would it be useful here?)

The dom0 and domU kernels, as well as xen itself, the associated 
symbols, and the same log files are located here, if someone needs them:
http://skaya.enix.org/webs/xen/dom0-lowmem/


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