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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Is anyone running lots of Xen HVM guests on a 3.10 Dom0 kernel?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We’ve had a few weird issues where PV guests are fine, but HVM guests are getting < 1Kb/s network throughput. The configuration on the host machine, VIF and inside the VM is fine. CPU and IO is fine too.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It only seems to affect servers with Broadcom network chipsets. Rolling back to a 3.4 Dom0 kernel fixes the problem, so its either driver (bnx2?) related or something else.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Not sure what to look at next to troubleshoot this as there are no errors anywhere, but if anyone has a test server with a brodcom NIC please can you test?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We’ve had this on 3 production servers now, but I cant really do any more testing on those as they are full of active VMs.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks<o:p></o:p></p><p class=MsoNormal>Chris<o:p></o:p></p></div></body></html>