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On Mon, Aug 20, 2012 at 12:45 PM, Lorin Hochstein
<lorin at nimbisservices.com> wrote:
>
> On Aug 20, 2012, at 9:59 AM, Thomas Vachon <vachon at sessionm.com> wrote:
>
> On Mon, Aug 20, 2012 at 9:57 AM, Lorin Hochstein
> <lorin at nimbisservices.com> wrote:
>
> On Aug 20, 2012, at 9:44 AM, Thomas Vachon <vachon at sessionm.com> wrote:
>
> OK, I have a feeling I know at least how to "fix" the issue.  After
> reading the entire thread, it seems to be 100% related to the
> checksumming of dhcp in QEMU (which is broken).
>
>
> Thomas:
>
> Do you have a link to the upstream bug that describes the DHCP checksum
> problem in QEMU? I'd like to add it to the docs.
>
>
> Take care,
>
> Lorin
> --
> Lorin Hochstein
> Lead Architect - Cloud Services
> Nimbis Services, Inc.
> www.nimbisservices.com
>
>
> This is the best one I can find:
> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/997978
>
>
> Ah, that one. I tried to document that issue in the Compute Admin guide
> under "KVM: network connectivity works initially, then fails":
> <http://docs.openstack.org/essex/openstack-compute/admin/content/network-troubleshooting.html#d6e6602>.
>
>
> Take care,
>
> Lorin
> --
> Lorin Hochstein
> Lead Architect - Cloud Services
> Nimbis Services, Inc.
> www.nimbisservices.com
>
>
>
>

I have just completed a test with Cassandra on 10.04 guests where I
inserted 4,000,000 each on average about 512 Mb.  I never saw it dump
the network. On average when running a 12.04 guest, I would see it
dump out after about 4GB of writes across the cluster. This problem
seems to be isolated to 12.04 guest QEMU code.  I still can run 12.04
as the host, just not the guest.