<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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<br><div><div>On Aug 20, 2012, at 12:54 PM, Thomas Vachon <<a href="mailto:vachon@sessionm.com">vachon@sessionm.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On Mon, Aug 20, 2012 at 12:45 PM, Lorin Hochstein<br><<a href="mailto:lorin@nimbisservices.com">lorin@nimbisservices.com</a>> wrote:<br><blockquote type="cite"><br>On Aug 20, 2012, at 9:59 AM, Thomas Vachon <<a href="mailto:vachon@sessionm.com">vachon@sessionm.com</a>> wrote:<br><br>On Mon, Aug 20, 2012 at 9:57 AM, Lorin Hochstein<br><<a href="mailto:lorin@nimbisservices.com">lorin@nimbisservices.com</a>> wrote:<br><br>On Aug 20, 2012, at 9:44 AM, Thomas Vachon <<a href="mailto:vachon@sessionm.com">vachon@sessionm.com</a>> wrote:<br><br>OK, I have a feeling I know at least how to "fix" the issue. After<br>reading the entire thread, it seems to be 100% related to the<br>checksumming of dhcp in QEMU (which is broken).<br><br><br>Thomas:<br><br>Do you have a link to the upstream bug that describes the DHCP checksum<br>problem in QEMU? I'd like to add it to the docs.<br><br><br><br>This is the best one I can find:<br><a href="https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/997978">https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/997978</a><br><br><br>Ah, that one. I tried to document that issue in the Compute Admin guide<br>under "KVM: network connectivity works initially, then fails":<br><http://docs.openstack.org/essex/openstack-compute/admin/content/network-troubleshooting.html#d6e6602>.<br><br></blockquote><br>I have just completed a test with Cassandra on 10.04 guests where I<br>inserted 4,000,000 each on average about 512 Mb. I never saw it dump<br>the network. On average when running a 12.04 guest, I would see it<br>dump out after about 4GB of writes across the cluster. This problem<br>seems to be isolated to 12.04 guest QEMU code. I still can run 12.04<br>as the host, just not the guest.<br></blockquote></div><br><div>I'll add to the docs that this bug appears to be specific to Precise guests.</div><div><br></div><div><br></div><div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Take care,</div><div><br></div><div>Lorin</div><div>--</div><div>Lorin Hochstein</div><div>Lead Architect - Cloud Services</div><div>Nimbis Services, Inc.</div><div><a href="https://www.nimbisservices.com/">www.nimbisservices.com</a></div><div><br></div></div></span><br class="Apple-interchange-newline"></div></body></html>