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xen-users
Re: [Xen-users] XCP ethernet jumbo frames????
Hi,
Sorry for the noise I have made. After reading the faq of Broadcom, (the
producer of the card) it urns out that it supports jumbo frames only
under mtu=9000, after turning under that value (and rebooting)
everything seems to work as expected.
Thank you for your help!
Geza
>> Jumbo frame support was still in development when XCP 0.5 was released.
>> Though it may work, you probably should not rely on what the PIF.MTU and
>> VIF.MTU fields tell you (in the most recent XCP snapshot this should have
>> been fixed). You should still be able to use ifconfig to find the MTU.
>>
>> Important is that you unplug and plug all VIFs and PIFs that are connected
>> to a network after changing the network's MTU, otherwise nothing happens.
>> Could you try this?
>>
>> Cheers,
>> Rob
>>
>>
>>
> Hi
>
> I'm absolutely sure that all the interfaces have been reinitialized
> because I've restarted the Dom0 after setting the MTU at the network.
>
>>> -----Original Message-----
>>> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
>>> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Gémes Géza
>>> Sent: 21 September 2010 06:00
>>> To: James Harper; xen-users@xxxxxxxxxxxxxxxxxxx
>>> Subject: Re: [Xen-users] XCP ethernet jumbo frames????
>>>
>>> 2010-09-21 00:27 keltezéssel, James Harper írta:
>>>
>>>
>>>>> Hi,
>>>>>
>>>>> I have an XCP 0.5 box running a few DomUs some of the DomU's data is
>>>>> stored at (clustered lvm volumes on) a Coraid etherdrive box which
>>>>>
>>>>>
>>> is
>>>
>>>
>>>>> connected via an Ethernet cable to a dedicated card of the XCP box,
>>>>>
>>>>>
>>> for
>>>
>>>
>>>>> which in the network config I' ve specified: MTU=9344: xe
>>>>> network-param-list uuid=.... gives:
>>>>> MTU ( RW): 9344
>>>>> on the DomUs if I leave the MTU at 1500 (default settings)
>>>>>
>>>>>
>>> everything
>>>
>>>
>>>>> works (slowly, but works). If I increase the MTU the aoe device
>>>>>
>>>>>
>>> appear
>>>
>>>
>>>>> as expected, but the data on it becomes inaccessible, even just
>>>>>
>>>>>
>>> trying
>>>
>>>
>>>>> to activate the lvm volume groups gives a bunch of IO errors at
>>>>>
>>>>>
>>> sector
>>>
>>>
>>>>> 0, and so on.
>>>>>
>>>>> Please tell me what I'm doing wrong. Are jumbo frames expected et
>>>>>
>>>>>
>>> all to
>>>
>>>
>>>>> work?
>>>>>
>>>>>
>>>>>
>>>>>
>>>> Does your network adapter really support jumbo frames?
>>>> Is the network adapter on a bridge? (I'm unsure if Dom0 does AoE or
>>>>
>>>>
>>> if the DomU's do)
>>>
>>>
>>>> Are all the bridge interfaces set to 9344 MTU?
>>>> Could tcp offload settings break any of this? (unlikely - AOE is not
>>>>
>>>>
>>> TCP)
>>>
>>>
>>>> tcpdump might tell you what's going on.
>>>>
>>>> James
>>>>
>>>>
>>>>
>>> The network adapter seems to be ok.
>>> I've tried to do aoe at the DomU's.
>>> I've set the network bridge's MTU at the bridge which is connected with
>>> the Coraid box.
>>>
>>> After some tcpdumping I've checked what the good old ifconfig would say
>>> about my interfaces. Surprisingly while xe network... reports MTU=9344
>>> ifconfig says it is at 1500 (the vifs attached to the bridge have 9344
>>> ), while xe pif... reports all interfaces to have MTU=1500 (I have an
>>> other interface set at MTU=4200, which shows itself even with ifconfig
>>> as having MTU=4200). I start to get really confused :-(
>>>
>>> Cheers
>>>
>>> Geza
>>>
>>> _______________________________________________
>>> 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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