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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] 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 > _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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