Re: [Xen-users] Writing fast in domU crashes entire xen system

[moncojhr <moncojhr@xxxxxxxxx>]

well I gave the vm more ram, and it didnt make any difference, my test
to see if it blows everything up is simply:

dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576
dd if=/dev/zero of=/test bs=1024 count=1048576

it always "crashes" before it completes all the dd's

> On Fri, Feb 18, 2011 at 10:06 PM, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:
>> On Fri, Feb 18, 2011 at 12:58 PM, moncojhr <moncojhr@xxxxxxxxx> wrote:
>>> Having a problem here where, if I write quickly in a domU, dom0
>>> freezes up and I cant do anything but reboot, you can still type, just
>>> nothing will ever do anything.
>>>
>>> I noticed that I am able to get much faster speeds writing in the domU
>>> then in dom0:
>>>
>>> dom0: 1073741824 bytes (1.1 GB) copied, 27.3189 s, 39.3 MB/s
>>> domU: 1073741824 bytes (1.1 GB) copied, 6.80832 s, 158 MB/s
>>>
>>> I do not get the freeze/lockup when writing in dom0, only when writing
>>> quickly a lot of data in domU.
>>>
>>> I am using file: for my vm's , using the 2.6.32.27 dom0 from git.
>>>
>>> Any help would be great!
>>>
>>> _______________________________________________
>>
>>
>>
>> It sounds like your domU doesn't have enough RAM  so it has to use a
>> lot of swap, which causes an I/O overload problem.
>>
>> Assign more RAM to the domU and see if it helps.
>>
>>
>> --
>> Kind Regards
>> Rudi Ahlers
>> SoftDux
>>
>> Website: http://www.SoftDux.com
>> Technical Blog: http://Blog.SoftDux.com
>> Office: 087 805 9573
>> Cell: 082 554 7532
>>
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>>
>

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