[Openstack-operators] Problem with Heavy Network IO and Dnsmasq
lorin at nimbisservices.com
Mon Aug 20 17:12:30 UTC 2012
On Aug 20, 2012, at 12:54 PM, Thomas Vachon <vachon at sessionm.com> wrote:
> 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).
>> 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.
>> This is the best one I can find:
>> Ah, that one. I tried to document that issue in the Compute Admin guide
>> under "KVM: network connectivity works initially, then fails":
> 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.
I'll add to the docs that this bug appears to be specific to Precise guests.
Lead Architect - Cloud Services
Nimbis Services, Inc.
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