[Fedora-xen] are dropped packets a sign of network problem?
Gabriel M. Schuyler
gabriel at intercastingcorp.com
Fri Oct 12 17:35:25 UTC 2007
We've had some network problems that were resolved by disabling tcp
checksum offloading on all the domUs. Our symptom was we couldn't
ssh (or do much else) between two domUs on the same physical host.
So on each domU we run:
sudo /sbin/ethtool -K eth0 tx off
Hope this helps!
Gabe
--
Gabriel M. Schuyler, sysop
Intercasting Corporation
On Oct 10, 2007, at 12:11 AM, progressdll wrote:
>
> in a xen environment , i see a lot op dropped packets via netstat -i
>
> Is this a sign of network problems, or is it normal to see this
> kind of
> numbers? i'm not sure how to interprete the data. is this normal, bad,
> critical. What are your stats on this?
>
> I guess i have a xen issue of some sort, but not sure what yet
>
> # netstat -i
> Kernel Interface table
> Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR
> TX-DRP
> TX-OVR Flg
> eth0 1500 0 53999491 0 0 0 6234874
> 0 0
> 0 BMRU
> lo 16436 0 9247734 0 0 0 9247734
> 0 0
> 0 LRU
> peth0 1500 0 135679270 0 0 0 95455766
> 0 0
> 0 BORU
> tap0 1500 0 5411876 0 0 0 35071803
> 0 0
> 0 BMRU
> vif-vmdeb 1500 0 0 0 0 0 35 0
> 333350
> 0 BORU
> vif0.0 1500 0 6234874 0 0 0 53999492
> 0 0
> 0 BORU
> vif6.0 1500 0 55813641 0 0 0 98482968 0
> 482338
> 0 BORU
> vif6.1 1500 0 0 0 0 0 39 0
> 46875771
> 0 BORU
> vif68.0 1500 0 0 0 0 0 0
> 0 0
> 0 BOU
> vif69.0 1500 0 9349348 0 0 0 30571290 0
> 3282
> 0 BORU
> vif69.1 1500 0 0 0 0 0 44 0
> 18947590
> 0 BORU
> vif70.0 1500 0 129605 0 0 0 460256
> 0 702
> 0 BORU
> vif70.1 1500 0 0 0 0 0 35 0
> 333350
> 0 BORU
> xenbr0 1500 0 46298695 0 0 0 0
> 0 0
> 0 BORU
>
> --
> View this message in context: http://www.nabble.com/are-dropped-
> packets-a-sign-of-network-problem--tf4598987.html#a13130626
> Sent from the Fedora Xen mailing list archive at Nabble.com.
>
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> Fedora-xen at redhat.com
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