[Fedora-xen] are dropped packets a sign of network problem?

[Gabriel M. Schuyler]

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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