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

Date: Fri, 18 Feb 2011 22:55:04 +1100

Delivery-date: Fri, 18 Feb 2011 03:56:29 -0800

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List-id: Xen user discussion <xen-users.lists.xensource.com>

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 >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@xxxxxxxxxxxxxxxxxxx >> http://lists.xensource.com/xen-users >> > _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users

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